Ist das eine Bombendrohung ?
Und ein "SOS" ?

https://www.strava.com/athletes/6179313
http://www.lutanho.net/mageye/screenshot-www.strava.com-2019-11-30-15-41-12-099.png

Und ist das eine "red flag"?
https://www.instagram.com/p/B5XE9RXHvrh/
http://www.lutanho.net/mageye/72617744_463302610988526_1029001757406655855_n.jpg
A signal of danger or a problem can be referred to as a red flag, a usage that originated in the 18th century. The term "red flag" is used, e.g., during screening of communications, and refers to specific words or phrases encountered that might indicate relevance to the case.