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(apropos PATTERN [#:macros? MACROS?] [#:qualified? QUALIFIED?] [#:sort SORT] [#:case-insensitive? CASE-INSENSITIVE?] [#:search-mode? SEARCH-MODE])procedure

Displays information about symbols matching PATTERN in the toplevel environment.

PATTERN
A symbol, string, irregex, irregex-sre, (quote symbol), (quote string). When unquoted symbol or string substring matching is performed. When quoted the string value is taken as an irregex regular expression string for use with search.
MACROS?
Either #t to include macros, or #f to skip them. Default is #f.
QUALIFIED?
Either #t to include qualified symbols or #f to skip them. Default is #f.
CASE-INSENSITIVE?
Either #t to use match case-insensitivity for the PATTERN or #f to be case-sensitive. Default is #f.
SORT
Either #:name for an symbol sort, or #:type for a type+indentifier sort, or #f for unsorted. The default is #:type.
SEARCH-MODE
Either #:prefix, #:suffix, or #t for contains. The default is #t.

Should PATTERN be a namespace qualified symbol the namespace will be dropped before conversion to a regular-expression.