e/Secret handshake

Information
has gloss	eng: A secret handshake is a series of hand gestures usually made as part of a handshake or other casual greeting which conveys membership in or loyalty to a club, clique or subculture. This type of shibboleth is most frequently associated in the popular consciousness with secret societies, particularly those assumed to be of a sinister nature or whose initiates are thought to provide preferential treatment to one another. Such signs generally evolve over time by necessity as for larger groups, which one is more likely to encounter members of in passing, they tend to become public knowledge over time.
lexicalization	eng: Secret handshake
instance of	(noun) the use of movements (especially of the hands) to communicate familiar or prearranged signals gesture, motion