org-emphasize
org-emphasize is an interactive compiled Lisp function in `org.el
'.
(org-emphasize &optional CHAR)
Insert or change an emphasis, i.e. a font like bold or italic.
If there is an active region, change that region to a new emphasis.
If there is no region, just insert the marker characters and position
the cursor between them.
CHAR should be the marker character. If it is a space, it means to
remove the emphasis of the selected region.
If CHAR is not given (for example in an interactive call) it will be
prompted for.