The "Green man" is a figure associated with the Pyrotechnics Guild International (PGI). He appears on the guild's emblem and was selected from John Bate's 1635 fireworks treatise, "The Second Booke", to symbolize the long tradition of using fireworks as an essential part of festivals and celebrations - at that time led by so-called "Green men" appointed to head processions with a "Fire Club" shooting sparks. They were called "Green men" because they clothed themselves with fresh leaves to protect themselves from sparks produced by their hand-held fireworks. This gave rise to the traditional salutation 'Stay Green' amongst those involved with fireworks.
Today, PGI members may refer to each other as "Green men".