an object, quality, or event whose presence or occurrence indicates the probable presence or occurrence of something else.
flowers are often given as a sign of affection
a gesture or action used to convey information or instructions.
she gave him the thumbs-up sign
each of the twelve equal sections into which the zodiac is divided, named from the constellations formerly situated in each, and associated with successive periods of the year according to the position of the sun on the ecliptic.
a person born under the sign of Virgo
the positiveness or negativeness of a quantity.
The sign of the constant of proportion, c, in the equation above, will determine whether the process is one of growth or of decay.