term-completion-addsuffix

term-completion-addsuffix is a variable defined in `term.el'.
Its value is

t

Documentation:
If non-nil, add a `/' to completed directories, ` ' to file names.
If a cons pair, it should be of the form (DIRSUFFIX . FILESUFFIX) where
DIRSUFFIX and FILESUFFIX are strings added on unambiguous or exact
completion. This mirrors the optional behavior of tcsh.

You can customize this variable.