sentinel. n. 1. a person, such as a sentry, assigned to keep guard. 2. (Computer Science) computing a character used to indicate the beginning or end of a particular block of information. vb (tr) , -nels, -nelling or-nelled.
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By Brendan Koerner. Giving the U.S. the old thumbs up. Iraqis are giving passing Americans the thumbs up sign, which the troops interpret as a symbol of support. But many veteran travelers insist that the gesture is a crass Middle Eastern insult.ow the thumbs up became an upbeat gesture in the first place is something of a mystery. Legend has it that the signal dates back to Roman gladiatorial contests.