sign

sign - noun

a perceptible indication of something not immediately apparent (as a visible clue that something has happened)

a public display of a message

any nonverbal action or gesture that encodes a message

structure displaying a board on which advertisements can be posted

(astrology) one of 12 equal areas into which the zodiac is divided

(medicine) any objective evidence of the presence of a disorder or disease

having an indicated pole (as the distinction between positive and negative electric charges)

an event that is experienced as indicating important things to come

a gesture that is part of a sign language

a fundamental linguistic unit linking a signifier to that which is signified

a character indicating a relation between quantities

sign - verb

mark with one's signature; write one's name (on)
approve and express assent, responsibility, or obligation
be engaged by a written agreement
engage by written agreement
communicate silently and non-verbally by signals or signs
place signs, as along a road
communicate in sign language
make the sign of the cross over someone in order to call on God for protection; consecrate

sign - adjective