https://thoughtcatalog.com/january-nelson/2018/03/all-the-hand-signs-and-gestures-you-need-to-express-exactly-how-you-feel/
https://en.m.wikipedia.org/wiki/Sign_of_the_horns
The allegation has been made that a photo of Jesse James and Donald Trump has them showing 'devil horns'.
Here is why that is not what it means:
1: the devil horns sign the hand is the other way around. the the palm would be facing away from the person. Donald and Jesse have it facing forward.
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The devil horns sign is given with one hand. Donald and Jesse use two hands.
there are other meanings, of course, and what those gentle men meant? maybe 'rock-n-rol' .