proceed signal
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Signal passed at danger — (SPAD), in railway terminology, describes an event where a train has run beyond its allocated signal block without authority, as indicated by a lineside signal showing danger (typically a red light). It is a term primarily used within the British … Wikipedia
Proceed-to-select — Proceed to select: In communications systems operation, pertaining to a signal or event in the call access phase of a data call, which signal or event confirms the reception of a call request signal and advises the calling data terminal equipment … Wikipedia
signal — Ⅰ. signal [1] ► NOUN 1) a gesture, action, or sound conveying information or an instruction. 2) an indication of a state of affairs. 3) an event or statement that provides the impulse or occasion for something to happen. 4) a light or semaphore… … English terms dictionary
Signal (computing) — A signal is a limited form of inter process communication used in Unix, Unix like, and other POSIX compliant operating systems. Essentially it is an asynchronous notification sent to a process in order to notify it of an event that occurred. When … Wikipedia
signal — signal1 noun 1》 a gesture, action, or sound conveying information or an instruction. 2》 an indication of a state of affairs. 3》 an event or statement that provides the impulse or occasion for something to happen. 4》 a light or semaphore on a… … English new terms dictionary
Railway signal — Not to be confused with Railway signalling. A signal is a mechanical or electrical device erected beside a railway line to pass information relating to the state of the line ahead to train/engine drivers. The driver interprets the signal s… … Wikipedia
Railway semaphore signal — One of the earliest forms of fixed railway signal is the semaphore. These signals display their different indications to train drivers by changing the angle of inclination of a pivoted arm . Semaphore signals were patented in the early 1840s by… … Wikipedia
USS Signal (1862) — a small 190 ton steamship was acquired during the second year of the American Civil War by the Union Navy and outfitted as a gunboat. She also served other types of duty, such as that of dispatch vessel and convoy escort. Built in West Virginia… … Wikipedia
International maritime signal flags — The set of signal flags on the bridge of the Liberty ship SS Jeremiah O Brien The system of international maritime signal flags is one system of flag signals representing individual letters of the alphabet in signals to or from ships. It is a… … Wikipedia
General Emergency Signal — The General Emergency Signal is a signal used on board cruise ships in times of emergency. The signal is composed of seven short blasts followed by one long blast on the ship s whistle and internal alarm system. On the first day of a cruise… … Wikipedia
Authority to Proceed — Authority to Proceed, ATP, is a term commonly used by government organisations or law enforcement agencies with reference to an organisation or department providing services, or to an individual waiting for go ahead signal to take a certain… … Wikipedia
