WITCH colon: Revision 3
"pair", "name", "imposter", "aspect", "ditto", "mirror"
: is not quite but almost the sigil for Pair objects
Operators containing this character
:: sigil and subset separator for packages (and consequently, types)
When used inside regexes
: can apply adverbs (a.k.a. modifiers, like :i) to individual parts rather than the whole expression
:: may often be seen after sigils with other special symbols but is only for scoping. Look in this section on the other characters' pages.
As an adverb
: introduces an adverbial Pair constructor which includes also radix in literal numbers.
: after a parameter name in a Signature names the invocant
Old, deprecated, or other language uses
? : the ternary operator from perl5 and other languages is ?? !! in perl6