The Collaborative International Dictionary of English v.0.48:

Sice \Sice\, n. [F. six, fr. L. sex six. See Six.]
   The number six at dice.
   [1913 Webster]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

SICE
       Society of Instrument and Control Engineers (org., Japan)