The closed-circuit condition in telegraphic communication, during which the signal actuates the printer; the opposite of space.

A distinguishing feature used to signal some particular location or condition.

1. A charted conspicuous object, structure, or light serving as an indicator for guidance or warning to craft; a beacon; it may be a day-beacon or sea-mark depending upon its location, or a day- mark or lighted beacon depending upon its period of usefulness.

2. Fathoms marked on a lead ine.

A designation followed by a serial number, used to identify models of military equipment.

The name or value given to a class interval; frequently, the value of the midpoint or the integer nearest the midpoint.