Variable: standard-indent
standard-indent is a customizable variable defined in indent.el.gz.
Value
4
Documentation
Default number of columns for margin-changing functions to indent.
Source Code
;; Defined in /usr/src/emacs/lisp/indent.el.gz
(defcustom standard-indent 4
"Default number of columns for margin-changing functions to indent."
:group 'indent
:type 'integer)