I have read about satanic symbols and signs and that made me conscious of people around me doing them. Christians, relatives, people I know who I believe cannot belong to any cult. Here are the common signs
The first and last it's claimed to be making obeisance to Satan showing his 2 horns and the middle one is claimed to be representing 3 6's = 666. Note the literal meaning written under the images, it is believed it is coded like that so people wouldn't know the actual meaning.
From the image below, captured from wikipaedia - OK-Sign, note the highlighted comment
How do other Christians view this? Does it matter if Christians show them?