Fylfot (or Fytfot)
i.e., four-footed, a term used to describe a mystical cross, made from the combination, in a cruciform arrangement, of four Greek gammas, thus (fig. 1), or thus (fig. 2); occasionally the small y was employed, thus (fig. 3). It was also called Gammaticum (Γαμματίον ), the Greek term for this mystical device. Its use formed a part of the ancient Secret Discipline in the primitive Church. (See GAMMADIA).