Tripod

Webster's Dictionary

(1): ( n.) Any utensil or vessel, as a stool, table, altar, caldron, etc., supported on three feet.

(2): ( n.) A three-legged frame or stand, usually jointed at top, for supporting a theodolite, compass, telescope, camera, or other instrument.

The Nuttall Encyclopedia

Seat with three legs on which the priestess of Apollo sat when delivering her oracles.