These are examples of signs.
sign in the symbolic of an idea sense
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sign in the astrological sense
"Hey baby, what's your sign?" -- man at bar
sign as in the omen sense
"If only God would give me some clear sign! Like making a large deposit in my name at a Swiss Bank." -- Woody Allen
sign as in the symptom sense
"When two people have been on enough dates, they generally fall in love. You can tell you're in love by the way you feel: your head becomes light, your heart leaps within you, you feel like you're walking on air, and the whole world seems like a wonderful and happy place. Unfortunately, these are also the four warning signs of colon disease, so it's always a good idea to check with your doctor." -- Dave Barry
sign in the symbol sense
"I argue very well. Ask any of my remaining friends. I can win an argument on any topic, against any opponent. People know this, and steer clear of me at parties. Often, as a sign of their great respect, they don't even invite me." -- Dave Barry
sign in the informational sense
"I went to the theater and the sign said adults $5 children $2.50. I told them I wanted 2 boys and a girl. I once took a cab to a drive-in movie. The movie cost me $95." -- Steven Wright