A children's game in which players take turns to place S's and O's on a grid, collecting points by creating an "SOS" sequence.
The conventional Morse code call made by a ship in distress.
Any symptom or occurrence in a disease, which serves to direct to suitable remedies.
That which serves to indicate or point out; mark; token; sign; symptom; evidence.
Act of pointing out or indicating.
Discovery made; information.
An declared approximation of the price at which a traded security is likely to commence trading.