event-basic-type

event-basic-type is a compiled Lisp function in `subr.el'.

(event-basic-type EVENT)

Return the basic type of the given event (all modifiers removed).
The value is a printing character (not upper case) or a symbol.
EVENT may be an event or an event type. If EVENT is a symbol
that has never been used in an event that has been read as input
in the current Emacs session, then this function may return nil.