Variables. A variable is a symbolic name for (or reference to) information. The variable's name represents what information the variable contains. They are called variables because the represented information can change but the operations on the variable remain the same. In general, a program should be written with Symbolic notation, such that a statement is always true symbolically.
Definition of overwatch. 1  1 archaic : to weary or exhaust by keeping awake. 2  2a obsolete : to watch through or throughout (as the night) b : to watch over. 3  3 : to support by fire another element which is moving tanks overwatching an assault battalion.
A modern wristwatch. A watch is a small timepiece intended to be carried or worn by a person. It is designed to keep working despite the motions caused by the person's activities. A wristwatch is designed to be worn on a wrist, attached by a watch strap or other type of bracelet. A pocket watch is designed for a person to carry in a pocket. Watches evolved in the 17th century from spring-powered clocks, which appeared as early as the 14th century.