Keeru (Keerd)
Lay, turn, coil. Also used in yarn manufacture for the direction of twist, e.g. s-keerd or z-keerd, S- or Z-twist, usually measured in tpi, or twists per inch. Two-ply yarns will tend to use one of each. Named, apparently, after the shape of the street which, relative to most Tallinn thoroughfares, is straight as a die...







