I started this story by looking at octet expansion and hypervalence in non-polar hypercoordinate species such as S(-CH ₃ ) ₆ , then moved on to S(=CH ₂ ) ₃ . Finally now its the turn of S(≡CH) ₂ . ^‡ As the triple bonds imply, this seems to represent twelve shared valence electrons surround the sulfur, six from S itself and three from each carbon.