Definitions:
an object, quality, or event whose presence or occurrence indicates the probable presence or occurrence of something else

a gesture or action used to convey information or an instruction

a notice on public display that gives information or instructions in a written or symbolic form

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

the positiveness or negativeness of a quantity

write one's name on (a letter, card, document, etc.) to identify oneself as the writer or sender

use gestures to convey information or instructions

indicate with signposts or other markers

mark or consecrate with the sign of the cross