<unk>  is an acronym for Superficial Muscular Aponeurotic System. It refers to an area of musculature of the face. This muscular system is manipulated during facial cosmetic surgery and is often performed as part of a rhytidectomy or face-lift.
SMAS
XMC
APC 
ELSI
G-LOC
OCLC
TIG1
Lncap