Sign of Trouble is a term used to describe a warning or indication that something is wrong. An OMEN (4 letters) is an event or occurrence that is believed to portend a good or BAD event in the future. SOS (3 letters) is an internationally recognized distress signal used by ships and aircraft. Badomen (7 letters) is a combination of the words 'BAD' and 'OMEN', and is used to describe a sign of impending danger or misfortune. Redflag (7 letters) is a warning sign or alert that something is wrong. Signalflare (11 letters) is a type of pyrotechnic device used to send visual distress signals. All of these terms are used to describe a warning or indication that something is wrong.