Billboard

• 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

• used of the language of the deaf

• 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

• large outdoor signboard