They are mudras. Consult HP Cobra's sermon ("Mudras"/Hand signs) on this in the Library.
Pyramid and the covering of one eye = the eye of the capstone symbolizing spiritual awareness and third eye, the Eye of Satan.
Joining up of fingers to make a pyramid shape (hakini mudra) = similar variation. (Merkel seems to do this one all the time...)
666/OK sign (666/chin or jnana mudra) = direction of energy toward spiritual perfection. In folk meaning, the circle made by the gap finger and thumb is taken to represent perfection.
Devil horns (apana mudra) = protection and health.
The enemy inverts the meanings of all these, naturally, or claims them for themselves.
I'm making an assumption here, but I think from what has been indicated, celebrities and fashion models are told to flash the hand signs by photographers and most of them do not really know what this means if anything. Some of the mudras are completely instinctive body language.
The Pope constantly flashes them of his own volition and does masonic handshakes too. The same goes for politicians, priests, imams and high level businessmen. This seems way more deliberate. The nazarene and its saints always have mudras flashing blatantly in catholic and orthodox depictions.