show-paren-mode

show-paren-mode is an interactive autoloaded compiled Lisp function in `paren.el'.

It is bound to <menu-bar> <options> <highlight-paren-mode>.

(show-paren-mode &optional ARG)

Toggle visualization of matching parens (Show Paren mode).
With a prefix argument ARG, enable Show Paren mode if ARG is
positive, and disable it otherwise. If called from Lisp, enable
the mode if ARG is omitted or nil.

Show Paren mode is a global minor mode. When enabled, any
matching parenthesis is highlighted in `show-paren-style' after
`show-paren-delay' seconds of Emacs idle time.