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.
1 Victory Sign is a full-service sign company. We specialize in all aspects of the sign industry from survey and permitting, fabrication, installation and service. 2  We are a small company, but pride ourselves on quality workmanship and reasonable prices. We are fully insured and provide our customers with free estimates.
Apparently a part of a periscope compass, where the main compass is mounted on the flying bridge, above the main, covered bridge, and where it is read from below through a periscope. Description: divided circle of the card visible on both sides (compare to tell-tale compass). North reference symbol: fleur-de-lis.