sentinels

noun

1
A sentry, watch, or guard.
2
A private soldier.
3
A unique string of characters recognised by a computer program for processing in a special way; a keyword.
“The tag is a sentinel that suspends web-page processing and displays the subsequent text literally.”
4
A sentinel crab.
5
A sign of a health risk (e.g. a disease, an adverse effect).
“sentinel animals can be used to explore endemic diseases.”

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