WordNet (r) 3.0 (2006):

full stop
    n 1: a punctuation mark (.) placed at the end of a declarative
         sentence to indicate a full stop or after abbreviations;
         "in England they call a period a stop" [syn: period,
         point, full stop, stop, full point]

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "full stop":
   arrest, bell, cessation, check, checkmate, cutoff, dead set,
   dead stand, dead stop, deadlock, dying down, ebb, ebbing, end,
   endgame, ending, final whistle, grinding halt, gun, halt, lock,
   lockout, sit-down strike, stalemate, stand, standoff, standstill,
   stay, stillstand, stop, stoppage, strike, subsidence, walkout,
   wane, waning, work stoppage