Perl 6
WITCH lpointy: Revision 3

Mnemonics

arrowhead, less than, sideways V for "values"

Used alone

< as an infix operator performs a comparison

Used as a brace pair or quote pair

<> is shorthand for the qw quoted array constructor, providing string context
<> can "treat things as a hash" like {}, but provides an uninterpolated string context. (e.g. %hash<value>)
<> can be used in Pair constructors in place of {}, providing uninterpolated string context (e.g. :key<value>)

Operators containing this character

<= is a comparison. Note this means there is no assignment mutation.
~< +< and ?< left bitwise shifts
<== or <<== a feed operator ?is the <<== form «== or not?

Other uses

<< can be used as a "Texas Quote", a substitute for « (left french quote) in environments where unicode source code is undesireable

Old, deprecated, or other language uses

<< is bitwise shift in many languages including perl5. That is now +<, ~<, or ?<


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