1) Part of SPQR 2) The s of spqr 
Latin for Senate
(Latin) a Roman body of men that originally advised the king and then the consuls; the number of men fluctuated but all had to be of good standing in the community (the censores could remove a man from the senate if necessary) and eventually needed to be a member of the equestrian order, that is, they needed to have property worth at least 400,000 ...