Above Church of Satan leader, Anton leVay, displaying the satanic handsign, which many in simple ignorance as to its symbolic significance use at rock concerts. So of course one can use this and not mean anything more than in the rock on, thumbs up sense. Ordinary adults don't however tend to use this gesture in normal life.
Below a few examples of others using this, sometimes in very formal, serious situations.
And even with the Queen. It is argued that this is a Texas college symbol that the Bushes' daughter attended. Even if accepting this explanation for the Bushes' rather demented use of this sign in utterly inappropriate circumstances, we are left with someone infantile to the point of brain damage, who even when meeting the British head of state as head of his own state, finds the temptation to flash the sign of his daughter's college irresistible. Bush is of course a member of the very disturbed Skull & Bones occult secret society, whose apparent nature is entirely in tandem with the more obvious explanation, that Bush is using this sign in the manner it is more famously recognised; ie a satanic symbol. "Satan who is the prince of thiss world," being a rather famous old line which should perhaps be taken much more literally than in loose allegorical manner. And Mrs Clinton. And Mr Clinton.