Having vision, not blind. / (in combination) Having a particular kind of sight.

Without sight; blind; unseeing. / Synonym of invisible

(military) Any call sign which represents two or more facilities, commands, authorities, or units. The collective call sign for any of these includes the commander thereof and all subordinate commanders therein.

(military) A call sign which does not represent a specific facility, command, authority, activity, or unit, but which may represent any one or any group of these.

(military) A call sign that represents all stations within a net.

(military) A call sign that identifies a tactical command or tactical communication facility.

(military) A call sign assigned in accordance with the provisions of the International Telecommunications Union to identify a radio station. The nationality of the radio station is identified by the first or the first two characters. (When used in visual signaling, international call signs are referred to as “signal letters.”)

(broadcasting) A combination of letters and numbers used to identify a radio or television station.

(broadcasting) The time of day when a radio or television station begins broadcasting, usually after being off the air for several hours. / Alternative form of sign-on

To join something, after signing. / To commit oneself, as to a project, a goal, an organization, a cause.