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*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/header.html).*
# Colon (`:`)
## `:`: Header
[→full documentation](../doc/block.md#block-headers)
Placed at the end of a block header. A header has syntax that matches the way the block is called. It indicates the block type, and number and structure of inputs.
"xy" {a‿b _op c: b} ∞
Multiple bodies are searched in order to find one with a matching header.
F ← {m Fn n: m+Fn n; 𝕊n: 2×n; 𝕊⁼𝕩: 𝕩÷2}
F 3 # 𝕊n
F⁼ 6 # 𝕊⁼𝕩
10 F 3 # m Fn n
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