Add the null character literal @

11 files changed, 28 insertions, 16 deletions

diff --git a/doc/syntax.md b/doc/syntax.md
index 9c34bc2a..c74c3b2f 100644
--- a/doc/syntax.md
+++ b/doc/syntax.md
@@ -12,6 +12,7 @@ Glyph(s)        | Meaning
 ----------------|-----------
 `#`             | [Comment](#comments)
 `'"`            | [Character or string literal](#constants)
+`@`             | [Null character](#constants)
 `¯∞π`           | [Used in numeric literals](#constants)
 `()`            | Expression grouping
 `←`             | [Define](#assignment)
@@ -48,6 +49,8 @@ Strings are written with double quotes `""`, and characters with single quotes `
 
         ≡¨ ⟨ "a" ⋄ 'a' ⟩   # A string is an array but a character isn't
 
+The null character (code point 0) has a dedicated literal representation `@`. This character can be used to directly convert between characters and numeric code points, which among many other uses allows tricky characters to be entered by code point: for example, a non-breaking space is `@+160`. The character can also be entered as a character literal, but this will display differently in various editors and some tools may have trouble with a file directly containing a null, so it is best to use `@` instead.
+
 ## Expressions
 
 *[More discussion](context.md)*
diff --git a/docs/bqn.js b/docs/bqn.js
index fc5baf61..b719a1f1 100644
--- a/docs/bqn.js
+++ b/docs/bqn.js
@@ -172,9 +172,9 @@ runtime.map((r,i) => {
 
 // Compiler
 let compile = run(
-  new 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,1,24,17,17,0,1,21,0,8,17,17,22,0,10,11,14,21,0,7,21,0,10,21,0,9,3,3,25,21,0,1,0,26,16,0,30,16,0,14,0,57,17,25,21,0,1,0,29,0,47,21,0,2,0,27,21,0,1,17,8,0,49,0,39,0,56,7,8,16,21,1,10,21,0,2,0,37,0,29,7,16,17,25,21,0,2,0,2,16,22,0,3,11,14,21,0,1,21,0,3,0,42,0,10,7,16,0,51,0,27,0,47,21,0,3,8,0,46,21,1,3,0,48,0,3,8,0,5,9,0,48,21,0,0,8,8,0,21,0,7,0,0,21,0,3,0,48,0,2,8,19,0,47,21,1,3,8,19,8,0,56,0,1,21,0,2,17,17,25,21,0,1,0,24,0,56,17,0,37,0,21,7,0,57,17,0,0,21,0,2,17,0,44,0,6,7,16,0,6,21,0,1,17,25,0,32,0,14,0,18,0,45,0,13,8,19,0,37,0,27,7,0,19,19,0,0,21,0,2,19,0,37,0,29,7,21,2,5,19,0,21,0,89,19,0,21,21,0,1,19,0,21,0,97,19,25])
+ ,[runtime[0],runtime[1],runtime[2],runtime[3],runtime[4],runtime[6],runtime[7],runtime[8],runtime[9],runtime[10],runtime[11],runtime[12],runtime[13],runtime[14],runtime[15],runtime[16],runtime[17],runtime[19],runtime[20],runtime[21],runtime[22],runtime[23],runtime[24],runtime[25],runtime[26],runtime[27],runtime[28],runtime[30],runtime[31],runtime[33],runtime[34],runtime[35],runtime[36],runtime[37],runtime[38],runtime[39],runtime[40],runtime[42],runtime[43],runtime[44],runtime[45],runtime[46],runtime[47],runtime[48],runtime[49],runtime[50],runtime[51],runtime[52],runtime[53],runtime[54],runtime[56],runtime[59],32,10,26,9,1,0,4,3,5,2,6,-1,3.14159265358979,Infinity,128,21,15,25,14,11,16,7,' ',str("+-×÷⋆√⌊⌈|¬∧∨<>≠=≤≥≡≢⊣⊢⥊∾≍↑↓↕⌽⍉/⍋⍒⊏⊑⊐⊒∊⍷⊔!"),str("˙˜˘¨⌜⁼´˝`"),str("∘○⊸⟜⌾⊘◶⎉⚇⍟"),str("⋄,"),str("←↩→"),str("(){}⟨⟩"),str("‿"),str("·"),str("𝕊𝕏𝕎𝔽𝔾𝕤𝕩𝕨𝕗𝕘"),str("@"),'0',str("¯.π∞"),str("_"),str("aA"),str(" "),str("Unclosed quote"),'\'','"',str("Unknown character"),str("s"),str(": "),'#',str("Missing "),str("opening"),str("closing"),str("Malformed bracket nesting"),str("Undefined identifier"),str("Swapped open and closed brackets"),str("Multiple definitions")]
+ ,[[0,1,0,35],[0,0,490,3],[1,1,556,4],[0,0,649,34],[0,0,1960,13],[0,0,2282,6],[0,0,2388,6],[0,0,2501,3],[0,0,2531,76],[0,0,5815,11],[0,0,5938,3],[0,0,5953,3],[0,0,5993,4],[0,0,6079,3],[2,1,6114,3]]
 );
 let bqn = src => run.apply(null,compile(str(src),runtime));
 
@@ -186,9 +186,9 @@ let fmt0 = x =>
     (x.glyph||(x.m?"*"+x.m+"-modifier*":"*function*"))
   : ""+x;
 let fmt1 = run(
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- ,[runtime[0],runtime[1],runtime[2],runtime[6],runtime[7],runtime[9],runtime[11],runtime[12],runtime[14],runtime[15],runtime[16],runtime[18],runtime[19],runtime[20],runtime[21],runtime[22],runtime[23],runtime[24],runtime[25],runtime[26],runtime[28],runtime[30],runtime[33],runtime[34],runtime[35],runtime[37],runtime[42],runtime[43],runtime[44],runtime[45],runtime[47],runtime[48],runtime[49],runtime[52],runtime[53],runtime[54],runtime[55],runtime[56],runtime[57],runtime[59],-1,Infinity,1,0,2,5,4,'\n',str("
- ,[[0,1,0,0],[1,0,3,19],[0,0,259,4],[0,0,312,6],[0,0,478,3],[0,0,508,3],[0,0,538,4],[0,0,662,3],[0,0,722,3],[0,0,761,3],[0,0,827,6],[0,0,1002,3],[0,0,1012,3],[0,0,1046,5],[0,0,1113,4],[0,0,1181,6],[0,0,1348,3],[0,0,1377,3]]
+  new Uint8Array([15,1,25,21,0,4,22,0,5,11,14,0,47,22,0,6,11,14,0,48,22,0,7,11,14,0,49,22,0,8,11,14,21,0,7,0,23,16,22,0,9,11,14,0,15,0,35,15,2,8,22,0,10,11,14,0,9,0,7,0,44,19,0,39,15,3,8,22,0,11,11,14,15,4,22,0,12,11,14,21,0,11,0,34,21,0,12,8,22,0,13,11,14,15,5,22,0,14,11,14,21,0,14,15,6,3,2,0,37,15,7,8,22,0,15,11,14,0,59,0,17,0,58,17,15,8,15,9,3,2,0,37,0,8,0,9,0,43,19,0,6,0,9,0,8,0,44,19,19,8,3,2,0,37,0,12,0,12,0,43,0,43,3,2,19,8,22,0,16,11,14,15,10,0,36,15,11,8,22,0,17,11,14,15,12,22,0,18,11,14,0,64,0,13,0,16,0,16,19,0,33,0,65,8,3,2,0,37,0,8,0,33,21,0,9,8,8,21,0,5,3,2,0,37,0,41,0,34,0,10,8,8,0,17,9,15,13,21,0,18,3,3,0,37,0,11,0,3,0,44,19,8,22,0,19,11,14,21,0,1,21,0,19,16,0,27,21,0,6,0,34,0,16,8,7,16,0,15,16,0,19,0,40,17,25,21,0,1,0,24,21,1,7,17,22,0,3,11,14,21,0,1,0,21,0,33,21,1,7,0,8,16,0,7,21,0,3,17,8,0,35,0,13,0,26,0,22,7,21,1,8,19,8,21,0,3,17,25,21,0,1,0,12,16,0,19,0,40,17,22,0,3,11,14,0,42,0,28,0,18,7,21,0,3,0,4,0,42,17,0,1,16,17,0,20,0,35,0,32,0,26,0,29,0,2,7,7,7,8,16,0,30,0,40,0,41,3,2,0,38,0,0,8,7,16,0,15,16,22,0,4,11,14,21,0,4,0,23,0,33,0,40,8,0,35,0,43,8,16,22,0,4,12,14,15,14,22,0,5,11,14,21,0,1,0,15,21,0,1,0,12,16,0,23,0,40,17,0,16,21,0,3,0,30,0,2,7,16,17,17,21,0,5,0,18,0,33,0,30,0,0,7,8,3,2,0,37,21,0,3,0,25,0,43,17,0,23,16,8,21,0,4,17,25,21,0,1,0,13,0,42,0,38,0,16,8,0,42,0,38,0,16,8,19,0,50,0,21,21,0,2,17,17,25,0,52,0,16,21,0,1,0,22,16,0,19,0,42,17,0,19,0,40,17,17,0,16,0,51,17,0,17,16,25,21,0,1,0,12,16,0,23,0,40,17,22,0,3,11,14,0,54,21,0,2,0,14,0,3,0,42,19,0,26,0,22,7,0,55,19,0,15,9,21,1,5,3,2,0,37,0,7,0,33,0,45,8,8,16,3,2,0,16,16,0,18,0,42,21,0,3,3,2,17,21,0,1,0,23,0,35,0,56,0,23,0,42,0,1,21,0,2,17,0,4,0,43,17,0,3,0,46,17,17,8,16,0,57,0,18,21,0,3,0,1,16,0,16,0,42,17,17,3,3,0,16,16,25,21,0,1,0,22,16,0,29,0,9,7,0,53,17,0,31,0,1,7,16,0,32,0,0,7,16,0,25,0,44,17,0,23,16,0,6,21,0,1,0,8,16,0,8,0,42,17,17,0,6,21,0,2,0,8,0,42,17,17,25,21,0,1,0,28,0,50,7,16,21,1,12,0,42,17,21,1,15,0,44,17,0,23,0,33,0,43,0,40,3,2,8,0,35,0,60,8,16,25,21,0,1,0,12,16,0,61,0,28,21,1,5,7,0,28,0,63,0,34,0,16,8,7,9,0,16,9,0,23,0,33,0,40,8,0,35,0,62,8,9,3,2,0,37,0,8,0,7,0,42,19,8,16,0,26,0,16,7,0,53,17,0,17,16,25,21,0,1,0,28,0,12,7,16,22,0,3,11,14,21,0,3,0,28,0,23,7,0,42,17,0,15,0,26,0,42,7,0,1,0,9,19,0,39,0,31,0,4,7,8,3,2,0,37,0,9,0,7,0,43,19,8,16,22,0,4,11,14,21,0,3,0,28,0,23,7,16,0,9,0,7,0,43,19,0,39,0,42,0,38,0,31,0,4,7,8,8,16,22,0,5,11,14,21,0,1,0,28,0,18,7,0,42,0,18,21,0,4,0,8,16,0,2,21,0,2,17,0,1,16,17,0,5,21,0,4,17,0,2,21,0,2,17,0,29,0,16,7,21,0,5,17,17,0,9,0,1,0,44,19,0,4,0,43,19,0,39,0,17,8,16,0,44,0,38,0,16,8,16,25,21,0,1,21,1,17,0,42,17,25,21,0,1,0,28,21,1,19,7,16,21,1,17,21,0,2,17,21,1,13,0,44,17,21,1,15,21,0,1,0,9,16,17,25,0,41,0,10,21,0,1,17,22,0,3,11,14,21,0,1,0,9,16,22,0,4,11,14,21,0,1,15,15,15,16,15,17,3,3,0,37,21,0,3,0,15,16,0,30,0,0,7,0,10,0,0,0,7,0,33,0,43,8,19,0,8,19,16,8,16,25,21,0,2,0,0,0,42,17,0,21,16,22,0,3,11,14,0,50,0,15,21,0,1,0,12,16,0,23,0,40,17,17,0,16,21,0,1,17,0,22,21,0,3,0,21,0,33,21,0,3,0,25,16,0,5,16,8,0,35,0,28,0,40,7,8,16,17,25,21,0,1,0,12,16,0,19,0,40,17,22,0,3,11,0,8,16,0,1,16,0,9,0,33,0,43,8,0,39,0,41,8,16,22,0,4,11,14,0,66,22,0,5,11,14,21,0,1,0,21,0,33,0,14,0,9,21,0,5,19,0,0,0,42,19,8,21,2,10,3,2,0,37,0,9,0,8,0,42,19,8,16,22,0,1,12,14,21,0,5,0,18,21,0,3,17,0,15,0,35,0,20,8,16,21,0,4,0,38,0,16,8,21,0,1,17,21,0,4,0,38,0,16,8,21,0,5,0,18,21,0,3,17,17,0,17,16,21,1,4,0,8,0,42,17,0,39,21,2,11,21,2,12,0,42,19,21,2,15,21,1,4,19,8,16,25,21,0,1,21,2,18,21,2,16,3,2,0,37,0,12,0,9,0,43,19,0,30,0,6,7,9,8,16,25,21,0,1,21,2,18,0,40,17,25])
+ ,[runtime[0],runtime[1],runtime[2],runtime[6],runtime[7],runtime[9],runtime[11],runtime[12],runtime[14],runtime[15],runtime[16],runtime[18],runtime[19],runtime[20],runtime[21],runtime[22],runtime[23],runtime[24],runtime[25],runtime[26],runtime[28],runtime[30],runtime[33],runtime[34],runtime[35],runtime[37],runtime[42],runtime[43],runtime[44],runtime[45],runtime[47],runtime[48],runtime[49],runtime[52],runtime[53],runtime[54],runtime[55],runtime[56],runtime[57],runtime[59],-1,Infinity,1,0,2,5,4,'\n',str("
+ ,[[0,1,0,0],[1,0,3,20],[0,0,285,4],[0,0,338,6],[0,0,504,3],[0,0,534,3],[0,0,564,4],[0,0,688,3],[0,0,748,3],[0,0,787,3],[0,0,853,6],[0,0,1028,3],[0,0,1038,3],[0,0,1072,5],[0,0,1139,4],[0,0,1207,6],[0,0,1374,3],[0,0,1403,3]]
 )(a=>str(fmt0(a)));
 let fmt = x => fmt1(x).map(c=>c===0?" ":c).join("");
 
diff --git a/docs/doc/fromDyalog.html b/docs/doc/fromDyalog.html
index dbb9ecd6..1ae69828 100644
--- a/docs/doc/fromDyalog.html
+++ b/docs/doc/fromDyalog.html
@@ -199,7 +199,7 @@
 <tr><td> <code><span class='Value'>f⍤</span><span class='Function'>B</span></code> </td><td colspan=2> <code><span class='Value'>f</span><span class='Modifier2'>⎉</span><span class='Function'>B</span></code>                       </td></tr>
 <tr><td> <code><span class='Value'>f⍤g</span></code> </td><td colspan=2> <code><span class='Value'>f</span><span class='Modifier2'>∘</span><span class='Value'>g</span></code>                       </td></tr>
 <tr><td> <code><span class='Value'>f⍥g</span></code> </td><td colspan=2> <code><span class='Value'>f</span><span class='Modifier2'>○</span><span class='Value'>g</span></code>                       </td></tr>
-<tr><td> <code><span class='Value'>f@v</span></code> </td><td colspan=2> <code><span class='Value'>f</span><span class='Modifier2'>⌾</span><span class='Paren'>(</span><span class='Value'>v</span><span class='Modifier2'>⊸</span><span class='Function'>⊏</span><span class='Paren'>)</span></code>                   </td></tr>
+<tr><td> <code><span class='Value'>f</span><span class='String'>@</span><span class='Value'>v</span></code> </td><td colspan=2> <code><span class='Value'>f</span><span class='Modifier2'>⌾</span><span class='Paren'>(</span><span class='Value'>v</span><span class='Modifier2'>⊸</span><span class='Function'>⊏</span><span class='Paren'>)</span></code>                   </td></tr>
 <tr><td> <code><span class='Value'>f⍠</span><span class='Function'>B</span></code> </td><td colspan=2> Uh                                     </td></tr>
 <tr><td> <code><span class='Value'>f⌸</span></code>  </td><td><code><span class='Function'>⍷</span><span class='Modifier2'>⊸</span><span class='Function'>⊐⊔↕</span><span class='Modifier2'>∘</span><span class='Function'>≠</span></code></td><td><code><span class='Function'>⍷</span><span class='Modifier2'>⊸</span><span class='Function'>⊐</span><span class='Modifier2'>⊸</span><span class='Function'>⊔</span></code>   </td></tr>
 <tr><td> <code><span class='Value'>f⌺</span><span class='Function'>B</span></code> </td><td colspan=2> <code><span class='Function'>↕</span></code>                         </td></tr>
diff --git a/docs/doc/syntax.html b/docs/doc/syntax.html
index aafb86d9..5fc5ff3a 100644
--- a/docs/doc/syntax.html
+++ b/docs/doc/syntax.html
@@ -25,6 +25,10 @@
 <td><a href="#constants">Character or string literal</a></td>
 </tr>
 <tr>
+<td><code><span class='String'>@</span></code></td>
+<td><a href="#constants">Null character</a></td>
+</tr>
+<tr>
 <td><code><span class='Number'>¯∞π</span></code></td>
 <td><a href="#constants">Used in numeric literals</a></td>
 </tr>
@@ -109,6 +113,7 @@
     <span class='Function'>≡</span><span class='Modifier'>¨</span> <span class='Bracket'>⟨</span> <span class='String'>&quot;a&quot;</span> <span class='Separator'>⋄</span> <span class='String'>'a'</span> <span class='Bracket'>⟩</span>   <span class='Comment'># A string is an array but a character isn't
 </span>⟨ 1 0 ⟩
 </pre>
+<p>The null character (code point 0) has a dedicated literal representation <code><span class='String'>@</span></code>. This character can be used to directly convert between characters and numeric code points, which among many other uses allows tricky characters to be entered by code point: for example, a non-breaking space is <code><span class='String'>@</span><span class='Function'>+</span><span class='Number'>160</span></code>. The character can also be entered as a character literal, but this will display differently in various editors and some tools may have trouble with a file directly containing a null, so it is best to use <code><span class='String'>@</span></code> instead.</p>
 <h2 id="expressions">Expressions</h2>
 <p><em><a href="context.html">More discussion</a></em></p>
 <p>Like APL, BQN uses four <em>syntactic roles</em> for values in expressions:</p>
diff --git a/docs/repl.js b/docs/repl.js
index e3baa789..2dbcc085 100644
--- a/docs/repl.js
+++ b/docs/repl.js
@@ -49,8 +49,8 @@ let typeChar = (t, c, ev) => {
   return false;
 }
 
-let syncls={ v:"Value", f:"Function", m:"Modifier", d:"Modifier2", n:"Number", g:"Gets", p:"Paren", b:"Bracket", k:"Brace", l:"Ligature", n:"Nothing", s:"Separator", c:"Comment" };
-let keydesc='f+Conjugate;Add_f-Negate;Subtract_f×Sign;Multiply_f÷Reciprocal;Divide_f⋆Exponential;Power_f√Square Root;Root_f⌊Floor;Minimum_f⌈Ceiling;Maximum_f∧Sort Up;And_f∨Sort Down;Or_f¬Not;Span_f|Absolute Value;Modulus_f≤Less Than or Equal to_f<Enclose;Less Than_f>Merge;Greater Than_f≥Greater Than or Equal to_f=Rank;Equals_f≠Length;Not Equals_f≡Depth;Match_f≢Shape;Not Match_f⊣Identity;Left_f⊢Identity;Right_f⥊Deshape;Reshape_f∾Join;Join to_f≍Solo;Couple_f↑Prefixes;Take_f↓Suffixes;Drop_f↕Range;Windows_f⌽Reverse;Rotate_f⍉Transpose;Reorder axes_f/Indices;Replicate_f⍋Grade Up;Bins Up_f⍒Grade Down;Bins Down_f⊏First Cell;Select_f⊑First;Pick_f⊐Index of_f⊒Occurrence Count;Progressive Index of_f∊Unique Mask;Member of_f⍷Deduplicate;Find_f⊔Group Indices;Group_f!Assert;Assert with message_m˙Constant_m˜Self/Swap_d∘Atop_d○Over_d⊸Before/Bind_d⟜After/Bind_d⌾Under_d⊘Valences_d◶Choose_d⎉Rank_m˘Cells_d⚇Depth_m¨Each_m⌜Table_d⍟Repeat_m⁼Undo_m´Fold_m˝Insert_m`Scan_b←Define_b↩Change_b→Return_s⋄Separator_s,Separator_p(Begin expression_p)End expression_k{Begin block_k}End block_b⟨Begin list_b⟩End list_l‿Strand_n·Nothing_v•System_v𝕨Left argument_f𝕎Left argument (as function)_v𝕩Right argument_f𝕏Right argument (as function)_v𝕗Modifier left operand (as subject)_f𝔽Modifier left operand_v𝕘2-modifier right operand (as subject)_f𝔾2-modifier right operand_v𝕤Current function (as subject)_f𝕊Current function_m𝕣Current modifier_n¯Minus_nπPi_n∞Infinity_c#Comment'.split(/[\n_]/);
+let syncls={ v:"Value", f:"Function", m:"Modifier", d:"Modifier2", n:"Number", g:"Gets", p:"Paren", b:"Bracket", k:"Brace", l:"Ligature", n:"Nothing", s:"Separator", c:"Comment", a:"String" };
+let keydesc='f+Conjugate;Add_f-Negate;Subtract_f×Sign;Multiply_f÷Reciprocal;Divide_f⋆Exponential;Power_f√Square Root;Root_f⌊Floor;Minimum_f⌈Ceiling;Maximum_f∧Sort Up;And_f∨Sort Down;Or_f¬Not;Span_f|Absolute Value;Modulus_f≤Less Than or Equal to_f<Enclose;Less Than_f>Merge;Greater Than_f≥Greater Than or Equal to_f=Rank;Equals_f≠Length;Not Equals_f≡Depth;Match_f≢Shape;Not Match_f⊣Identity;Left_f⊢Identity;Right_f⥊Deshape;Reshape_f∾Join;Join to_f≍Solo;Couple_f↑Prefixes;Take_f↓Suffixes;Drop_f↕Range;Windows_f⌽Reverse;Rotate_f⍉Transpose;Reorder axes_f/Indices;Replicate_f⍋Grade Up;Bins Up_f⍒Grade Down;Bins Down_f⊏First Cell;Select_f⊑First;Pick_f⊐Index of_f⊒Occurrence Count;Progressive Index of_f∊Unique Mask;Member of_f⍷Deduplicate;Find_f⊔Group Indices;Group_f!Assert;Assert with message_m˙Constant_m˜Self/Swap_d∘Atop_d○Over_d⊸Before/Bind_d⟜After/Bind_d⌾Under_d⊘Valences_d◶Choose_d⎉Rank_m˘Cells_d⚇Depth_m¨Each_m⌜Table_d⍟Repeat_m⁼Undo_m´Fold_m˝Insert_m`Scan_b←Define_b↩Change_b→Return_s⋄Separator_s,Separator_p(Begin expression_p)End expression_k{Begin block_k}End block_b⟨Begin list_b⟩End list_l‿Strand_n·Nothing_v•System_v𝕨Left argument_f𝕎Left argument (as function)_v𝕩Right argument_f𝕏Right argument (as function)_v𝕗Modifier left operand (as subject)_f𝔽Modifier left operand_v𝕘2-modifier right operand (as subject)_f𝔾2-modifier right operand_v𝕤Current function (as subject)_f𝕊Current function_m𝕣Current modifier_n¯Minus_nπPi_n∞Infinity_a@Null character_c#Comment'.split(/[\n_]/);
 let kk=Array.from('`123456890-=~!@#$%^&*()_+qwertuiop[]QWERTIOP{}asdfghjkl;ASFGK:"zxcvbm,./XVBM<> \'');
 let kv=Array.from('˜˘¨⁼⌜´˝∞¯•÷׬⎉⚇⍟◶⊘⎊⍎⍕⟨⟩√⋆⌽𝕨∊↑∧⊔⊏⊐π←→↙𝕎⍷𝕣⍋⊑⊒⍳⊣⊢⍉𝕤↕𝕗𝕘⊸∘○⟜⋄↖𝕊𝔽𝔾⌾·˙⥊𝕩↓∨⌊≡∾≍≠𝕏⍒⌈≢≤≥‿↩');
 let keys={}, revkeys={};
diff --git a/editors/vim/autoload/bqn.txt b/editors/vim/autoload/bqn.txt
index 27fb10bf..785bc281 100644
--- a/editors/vim/autoload/bqn.txt
+++ b/editors/vim/autoload/bqn.txt
@@ -13,6 +13,7 @@
 ⟩ End list
 ‿ Strand
 · Nothing
+@ Null character
 ' Character
 " String (list of characters)
 • System
diff --git a/md.bqn b/md.bqn
index 0c108300..c2e424e1 100644
--- a/md.bqn
+++ b/md.bqn
@@ -482,7 +482,7 @@ GetHighlights ← {
     "Ligature"    , "‿"
     "Nothing"     , "·"
     "Separator"   , "⋄,"
-    "String"      , "'"""
+    "String"      , "'""@"
     "Comment"     , "#"
   ⟩
   # Turn non-whitespace classes into ⟨open,close⟩ html tags.
diff --git a/spec/literal.md b/spec/literal.md
index 2d4f2225..dad93acb 100644
--- a/spec/literal.md
+++ b/spec/literal.md
@@ -4,7 +4,7 @@
 
 A *literal* is a single [token](token.md) that indicates a fixed character, number, or array. While literals indicate values of a data type, [primitives](primitive.md) indicate values of an operation type: function, 1-modifier, or 2-modifier.
 
-Two types of literal deal with text. As the source code is considered to be a sequence of unicode code points ("characters"), and these code points are also used for BQN's character [data type](types.md), the representation of a text literal is very similar to its value. In a text literal, the newline character is always represented using the ASCII line feed character, code point 10. A *character literal* is enclosed with single quotes `'` and its value is identical to the single character between them. A *string literal* is enclosed in double quotes `"`, and any double quotes between them must come in pairs, as a lone double quote marks the end of the literal. The value of a string literal is a rank-1 array whose elements are the characters in between the enclosing quotes, after replacing each pair of double quotes with only one such quote.
+Two types of literal deal with text. As the source code is considered to be a sequence of unicode code points ("characters"), and these code points are also used for BQN's character [data type](types.md), the representation of a text literal is very similar to its value. In a text literal, the newline character is always represented using the ASCII line feed character, code point 10. A *character literal* is enclosed with single quotes `'` and its value is identical to the single character between them. A *string literal* is enclosed in double quotes `"`, and any double quotes between them must come in pairs, as a lone double quote marks the end of the literal. The value of a string literal is a rank-1 array whose elements are the characters in between the enclosing quotes, after replacing each pair of double quotes with only one such quote. The *null literal* is the token `@` and represents the null character, code point 0.
 
 The format of a *numeric literal* is more complicated. From the [tokenization rules](token.md), a numeric literal consists of a numeric character (one of `¯∞π.0123456789`) followed by any number of numeric or alphabetic characters. Some numeric literals are *valid* and indicate a number, while others are invalid and cause an error. The grammar for valid numbers is given below in a [BNF](https://en.wikipedia.org/wiki/Backus%E2%80%93Naur_form) variant. Only four alphabetic characters are allowed: "i", which separates the real and imaginary components of a complex number, "e", which functions as in scientific notation, and the uppercase versions of these letters.
 
diff --git a/spec/token.md b/spec/token.md
index 173756f4..11c3d1fa 100644
--- a/spec/token.md
+++ b/spec/token.md
@@ -18,6 +18,7 @@ Otherwise, a single character forms a token. Only the specified set of character
 
 | Class                 | Characters
 |-----------------------|------------
+| Null literal          | `@`
 | Primitive Function    | `+-×÷⋆√⌊⌈\|¬∧∨<>≠=≤≥≡≢⊣⊢⥊∾≍↑↓↕⌽⍉/⍋⍒⊏⊑⊐⊒∊⍷⊔`
 | Primitive 1-Modifier  | `` ˙˜˘¨⌜⁼´˝` ``
 | Primitive 1-Modifier  | `∘○⊸⟜⌾⊘◶⎉⚇⍟`
diff --git a/src/c.bqn b/src/c.bqn
index 0b012b72..27350f03 100644
--- a/src/c.bqn
+++ b/src/c.bqn
@@ -1,7 +1,7 @@
 #! ./dzref
 
-tab←'	'⋄nl←'
-'
+nul←' '-32  # @
+nl←nul+10
 charSet←∾charGroups←⟨
   chF←"+-×÷⋆√⌊⌈|¬∧∨<>≠=≤≥≡≢⊣⊢⥊∾≍↑↓↕⌽⍉/⍋⍒⊏⊑⊐⊒∊⍷⊔!" # Function
   "˙˜˘¨⌜⁼´˝`"           # Modifier
@@ -12,10 +12,11 @@ charSet←∾charGroups←⟨
   "‿"                   # Ligature
   "·"                   # nOthing
   "𝕊𝕏𝕎𝔽𝔾𝕤𝕩𝕨𝕗𝕘"          # Input (𝕣 pending; ℝ not allowed)
+  "@"                   # nUll character
   '0'+↕10               # Digit
   "¯.π∞"                # Numeric
   "_"∾˜⥊"aA"+⌜↕na←26    # Alphabetic
-  " "∾tab               # Whitespace
+  " "∾nul+9             # Whitespace
 # #'" eliminated during tokenization
 ⟩
 ErrUnknownChars←{
@@ -26,7 +27,7 @@ CharCode←charSet{
   Chk ← ⊢⊣ErrUnknownChars∘(≠/⊣)⍟≢⟜(⊏⟜𝕗)
   g←⍋𝕗 ⋄ ⊢ Chk g⊏˜1-˜1⌈(g⊏𝕗)⍋⊢
 }
-bF‿bM‿bC‿bS‿bG‿bB‿bL‿bO‿bI‿bD‿bN‿bA‿bW←≍¨˜⟜(+`≠↑0∾⊢)≠¨charGroups
+bF‿bM‿bC‿bS‿bG‿bB‿bL‿bO‿bI‿bU‿bD‿bN‿bA‿bW←≍¨˜⟜(+`≠↑0∾⊢)≠¨charGroups
 bA_e←4+⊑bA
 M←1⊸⊑(0⊸≤∧>)-⟜⊑
 vi←+´≠¨9↑charGroups
@@ -47,6 +48,7 @@ Tokenize←{
 
   c←cl-˜CharCode(⊑charSet)¨⌾(cl⊸/)f/𝕩
   w←(≠↑0∾⊢)⊸<l←c M (⊑bD)≍+´1⊑¨bD‿bN‿bA
+  u←c=⊑bU⋄l+↩u⋄w+↩u
   us←c=¯1++´bA
   id←(1-˜(us<l)×+`w)⊔na(⊢-⊣×+⟜(⊑bA)⊸≤)c
   ti←na⌊∘÷˜(⊑bA)-˜w/c
@@ -70,7 +72,7 @@ ReadNum←{
   m←(n=⊑)◶⟨Pos,-·Pos 1⊸↓⟩e↑𝕩
   𝕩×⟜(10⋆·Int(e+1)↓⊣)˜⍟(e<≠𝕩)m
 }
-LitVal←(⊑("'"∾'"')⊐⊏)◶⟨1⊸⊑,1⊸↓,ReadNum⟩
+LitVal←(⊑⟨⊑bU,''','"'⟩⊐⊏)◶⟨nul,1⊸⊑,1⊸↓,ReadNum⟩
 
 
 LEBv ← {
diff --git a/src/fmt.bqn b/src/fmt.bqn
index ac5d3025..b9296b66 100644
--- a/src/fmt.bqn
+++ b/src/fmt.bqn