1. Detectable transmitted energy that can be used to carry
information.
2. A
time-dependent variation of a characteristic of a physical phenomenon, used to convey information.
3. As applied to electronics, any transmitted electrical
impulse. [
JP1]
4. Operationally, a type of
message, the text of which consists of one or more letters, words, characters, signal flags, visual displays, or special sounds, with prearranged meaning and which is conveyed or transmitted by visual, acoustical, or electrical means. [
JP1]