Perl 6
WITCH colon: Revision 1
^ Mnemonics

"pair", "twin", "ditto", "reflection", "aspect"
-- used to alias identifiers
-- used to create associative pair objects
-- used in package namespaces
-- "everyone wants the colon"<>


^ Used alone

: 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)
: before () creates a "Signature object"<>
:= 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

^ 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"<>

^ Hyper operator and meta operator restrictions

^ Old, deprecated, or other language uses

? : the ternary operator from perl5 and other languages is ?? !! in perl6

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