Perl 6
WITCH equal: Revision 4
^ Mnemonics

"equal", "evaluate", "iterate"

^ Used alone

= assigns values as in common parlance
= after many infix operators creates a mutant assignment form of that operator
= inside a Signature marks parameters as optional and supplies default values
= after a property supplies it with an initial value
= at the beginning of a line may be introducing a "POD element"<>

^ Operators containing this character

:= aliases an identifier via "runtime binding"<>
::= aliases an identifier via "compile time binding"<>
=:= "container identity comparitor"<>
!= is short for !==
== compares for value equivalence
=== compares containers or values with dwimmery
{{>=}} {{<=}} and {{<=>}} are also "comparisons"<>. Note this means there is no assignment mutation.
{{=>}} "fat arrow" pair constructor
{{p5=>}} the "perl5 compatibility fat arrow"<>
{{=}} {{=>}} {{=}} {{=>>}} {{<<=}} {{=}} {{<=}} {{=}} are "feed operators"<>

^ When used inside regexes

= is used to "declare aliases"<> and behaves a bit more like := in this usage.

^ Special Variables

^ As an adverb

^ Other Uses

^ Hyper operator and meta operator restrictions

^ Old, deprecated, or other language uses

=~ in Perl5 used to be for matching. That is ~~ in Perl6. =~ is always a syntax error in Perl6.
= as a prefix operator used to be used to do what is now Iterator.get (and IO.get, IO.lines)
=$*IN as prefix to filehandle is a case of the above which was common in early Perl6 documentation

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