Rulering is the practice of using a ruler as a convenient, hence in some, mainly scholar, traditions popular, tool for a corporal punishment, usually on the hands (either outstretched palms or knuckles) or thighs, sometimes a spanking (on the buttocks). A ruler is an instrument used in geometry and technical drawing to measure short distances and/or to rule straight lines. ... It has been suggested that this article or section be merged into Corporal punishment. ... A human hand typically has four fingers and a thumb. ... Diagram of the human thigh bone In humans the thigh is the area between the pelvis and buttocks and the knee. ... Spanking (or smacking) is the most used traditional form of physical punishment, consisting of a sharp smack, usually with an open hand, applied on the buttocks. ...

In BDSM, where it occurs especially in role-play context, this an also be a voluntary, sometimes even non-punitive practice. A collar is a common symbol in BDSM. BDSM is a term which describes a number of related patterns of human sexual behavior. ...

Generally, solid, heavy wooden or metal rulers are used for these purposes, but lighter, often flexible plastic ones can also be used punitively. Thus the wooden regla (Spanish for ruler) was widely used in schools to punish pupils: the 12" one was applied as a ferule (see palmeta) on the hands, the yard long one (made for drawing in the blackboard; rather like a yardstick) as a rod for spanking. WOOD is a pair of radio stations in Grand Rapids, Michigan owned by Clear Channel on the frequencies of 1300 AM and 105. ... Plastic covers a range of synthetic or semisynthetic polymerization products. ... A yardstick is a tool to measure distances up to three feet (a yard). ... Spanking (or smacking) is the most used traditional form of physical punishment, consisting of a sharp smack, usually with an open hand, applied on the buttocks. ...

In the United States, this method of punishment is more common in private than public schools.