sentinel

(redirected from sentinels)
Also found in: Dictionary, Thesaurus.

sentinel

Computing a character used to indicate the beginning or end of a particular block of information
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

sentinel

[′sent·ən·əl]
(computer science)
Symbol marking the beginning or end of an element of computer information such as an item or a tape.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in classic literature ?
A sentinel at each end of the bridge stood with his rifle in the position known as "support," that is to say, vertical in front of the left shoulder, the hammer resting on the forearm thrown straight across the chest -- a formal and unnatural position, enforcing an erect carriage of the body.
But instead of that, at the next village the sentinels of Davout's infantry corps detained him as the pickets of the vanguard had done, and an adjutant of the corps commander, who was fetched, conducted him into the village to Marshal Davout.
A single sentinel in the rear of the building barred the way.
Sentinels likewise were posted at the lodgings of the officers in many parts of the town.
"It is this, sir," said the king, angrily, "that General Cromwell has reached Newcastle; that you knew it and I was not informed of it; that the enemy have left the town and are now closing the passages of the Tyne against us; that our sentinels have seen this movement and I have been left unacquainted with it; that, by an infamous treaty you have sold me for two hundred thousand pounds to Parliament.
Men and women looked down upon him from shadowy balconies, but spoke not; and sentinels saw him pass and did not challenge.
On a rock which overlooked the track, showing out dark and plain against the sky, there stood a solitary sentinel. He saw them as soon as they perceived him, and his military challenge of "Who goes there?" rang through the silent ravine.
In its front might be seen the scattered sentinels, who held a weary watch against their numerous foes; and within the walls themselves, the travelers looked down upon men still drowsy with a night of vigilance.
"The house, indeed!" growled the Sentinel. "Have you never seen a Palace in your life?
Hold your tongue." He turned to the sentinel and added in German, "Draw the curtain again; and if the woman persists, put her back into this room with your own hand."
On preparing the morning's meal, however, a number of cups, knives, and other articles were missing, which had, doubtless, been carried off by the fictitious elk, during the slumber of the very sagacious sentinel. As the Indians had gone off in the direction which the trappers had intended to travel, the latter changed their route, and pushed forward rapidly through the "Bad Pass," nor halted until night; when, supposing themselves out of the reach of the enemy, they contented themselves with tying up their horses and posting a guard.
Fouquet gained ground, regardless of the cries of the man, who, however, having at last come up with Fouquet, called out to the sentinel of the second gate, "Look out, look out, sentinel!" The man crossed his pike before the minister; but the latter, robust and active, and hurried away, too, by his passion, wrested the pike from the soldier and struck him a violent blow on the shoulder with it.