Perl 6
WITCH underscore: Revision 1

Mnemonics

"Understood", as in a grammatical understood subject
A solid version of a space

Builtin Variable

$_ is the current topic, receiving iterators inside loops, etc.
@_ contains ordered parameters inside perl5ish subroutines or pointy blocks,
%_ is like @_ but contains named parameters.

Special Uses

_ is the only symbol allowed within identifier names along with numbers and letters
_ can also be included inside literal numbers to separate digits for purely cosmetic purposes

Old, deprecated, or other language uses

For a while, _ was considered to replace . as the string concatinator, but ~ was chosen for that instead


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