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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Waving this white flag signals victory. June 16, 2009|By Tribune staff. For Cubs fans, the flying of the W flag after a victory is a great tradition. (One, by the way, that many White Sox fans loathe, which makes Cubs fans love it even more.) But now it's teetering on the ridiculous. The custom began in the 1940s.