See Mercury.

Originally, a boundary stone dedicated to Hermes as the god of boundaries, and therefore bearing in some cases a head, or head and shoulders, placed upon a quadrangular pillar whose height is that of the body belonging to the head, sometimes having feet or other parts of the body sculptured upon it. These figures, though often representing Hermes, were used for other divinities, and even, in later times, for portraits of human beings. Called also herma. See Terminal statue, under Terminal.

Ermes - Olympian messenger. Son of Zeus and Maia, the daughter of Atlas. Famed for his golden sandals and lyre and associated with delivering entreaties of peace, travel and commerce although also renowned for his mischievous nature and theft of Apollo's cattle. Quickly became the trusted messenger of Zeus and was the one to lead Hera, Aphrodite and Athena to learn the judgement of Paris as to which of the three goddesses should receive the apple Eris had tossed onto the table at the wedding of Thetis and Peleus

An experiment located at the DESY laboratory. HERMES uses the polarized electron beam of HERA. For more information, see: http://www-hermes.desy.de/.