Stigma (letter) sigma form ς never occurs inside a word and is never used as a numeral either. Uppercase forms of stigma as a numeral (Ϛ) are rare in practice; when they occur, they can often be confused with uppercase forms of another numeral symbol, koppa (Ϟϟ), which stands for 90. Stigma is encoded in Unicode as "Greek letter stigma" U+03DA (Ϛ) and "Greek small letter stigma" U+03DB (ϛ). Stigma (letter) Stigma (ϛ) is a ligature of the Greek letters sigma (Σ) and tau (Τ), which was used in writing Greek between the Middle Ages and the 19th century. It is also
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