San (letter) San (letter) San (Ϻ) was an archaic letter of the Greek alphabet. Its shape was similar to modern M, or ϡ, or to a modern Greek Sigma (Σ) turned sideways, and it was used as an alternative to Sigma to denote the sound . Unlike Sigma, whose position in the alphabet is between Rho and Tau, San appeared between Pi and Qoppa in alphabetic order. In addition to denoting this separate archaic character, the name "San" was also used as an alternative name to denote the standard letter Sigma. The existence of the two competing letters Sigma and San is
Pound-foot (torque) unit is often still referred to as the foot-pound (ft⋅lbf). Similarly, an inch-pound (though should be more correctly as "pound-inch") is the torque of one pound of force applied to one inch of distance from the pivot, and is equal to of a pound-foot. It is commonly used on torque wrenches and torque screwdrivers for setting specific fastener tension. Pound-foot (torque) A pound-foot (lbf⋅ft) is a unit of torque (a pseudovector). One pound-foot is the torque created by one pound of force acting at a perpendicular distance of one foot from a pivot point. Conversely one pound-foot is the moment