Specific ways of holding hands or applying pressure to certain knuckles.
Passwords corresponding to different degrees, such as Entered Apprentice, Fellowcraft, and Master Mason. Masonic Secrets Revealed - Secrets of the Masons
Historically, these served a practical purpose: medieval stonemasons traveled from site to site and used these secret signs to prove their rank and skill level to foremen, ensuring they received the correct pay for their expertise. 2. Rituals and Allegories Specific ways of holding hands or applying pressure