2H- - What Does 2H- Stand For?

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What does 2H- stand for? 2H Polytype by Guest on Jul 29, 2010 1-1 of 1 definition 1 page: << back 1 next >>	Browse 2G 2G2 2G2B4G 2G2BT 2GL 2H 2H+ 2H- 2HB 2HD 2HPP 2HS/2HE 2IC 2J 2K

What does 2H- stand for?