Perl 6
WITCH colon: Revision 2
^ Mnemonics

"pair", "name", "imposter", "aspect", "ditto", "mirror"
-- used to alias identifiers
-- used to create adverbs and pairs
-- used to control what is visible
-- "everyone wants the colon"<>


^ Used alone

: is "essentially the sigil for Pair"<> objects
: after a identifier at a statement boundary "creates a label"<> as in common parlance
: after an identifier is an "invocant marker"<> for indirect object syntax

^ Operators containing this character

:: "sigil and nesting separator"<> for packages (and consequently, types)
:() creates a "Signature object"<> and is used in "closure parameters"<>
:= aliases an identifier via "runtime binding"<>
::= aliases an identifier via "compile time binding"<>
.: "dotted postfix form"<> of prefix operator
.:: a "class qualified method call"<>
=:= "container identity comparitor"<>

^ When used inside regexes

: can "apply adverbs"<> (a.k.a. modifiers, like :i) to individual parts rather than the whole expression
: :? :! :: ::: used like a repeat count performs "backtracking control"<>
<::> inside extensible metasyntax denotes a "symbolic indirect subrule"<>

^ Special Variables

:: _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.
_If you have a short-form adverb you don't understand, see this section in the page for the character after the colon._

^ Other Uses

: after a parameter name in a Signature "names the invocant"<>
: creates "named parameters"<> in Signatures

^ Old, deprecated, or other language uses

? : the ternary operator from perl5 and other languages is ?? !! in perl6
: may not be used as a "regexe delimiter"<> as allowed in perl5

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