calendar-today-marker

calendar-today-marker is a variable defined in `calendar.el'.
Its value is

calendar-today

Documentation:
How to mark today's date in the calendar.
The value can be either a single-character string (e.g. "=") or a face.
Used by `calendar-mark-today'.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 23.1 of Emacs.