KGT p. 58. On the toe of each high boot, likewise made of animal hide, was a claw-like spike called a pu'. The word pu' now means "phaser," and the newer meaning probably developed from the older "spike" because of the lightning speed with which one delivered a blow with the sharp pu'. In contemporary Klingon,the spike on the toe of a boot is always called a DaSpu', never pu' alone.