No it most certainly isnt, to break all the bonds in the glycerol you need to put in an enthalpy of +6974 and the energy released when the bonds reform is -5852, so you get less energy out then you put in so it wont burn.
People often wear a ring on their index finger to demonstrate assertiveness, or power. The Middle Finger - The Meaning of the Middle Finger for Rings: Identity & Materialism - Being the tallest finger, the middle finger is associated with our purpose in life.
A black ring on the left fingers has no official meaning, to the best of my knowledge. It's just the right fingers that the swinger community has taken :) (Correct me if I'm wrong, I am not aware of any polyamorous conventions, just the swinger community's conventions).