Keywords in The Racket Guide introduces keywords.
A keyword is like an interned symbol, but its printed
form starts with #:, and a keyword cannot be used as an
identifier. Furthermore, a keyword by itself is not a valid
expression, though a keyword can be quoted to form an
expression that produces the symbol.
Two keywords are eq? if and only if they print the same
(i.e., keywords are always interned).
Like symbols, keywords are only weakly held by the internal keyword
table; see Symbols for more information.
See Reading Keywords
for information on reading
keywords and Printing Keywords
for information on printing keywords.
Returns #t if v is a keyword, #f otherwise.
Returns a string for the display
ed form of keyword
not including the leading #:
Returns a keyword whose display
ed form is the same as that of
, but with a leading #: