Patrik,
a wooden hand on a long stick was originally used as the
standard or
signum of the maniple. Later, it was also used by cohorts. For a (modern) example, see here:
http://commons.wikimedia.org/wiki/File:Roman_signum.jpg It is not exactly clear what it represented. However, some scholars have seen the hand of the commander in it.
Thus, the three standards in the
reverse may be interpreted as the
legionary eagle (
aquila) as well as two other signa, potentially representing cohorts or maniples or both.
Regards
Thilo