a system for sending messages in which you hold two flags in various positions to represent different letters and numbers
But with Nev, she’d already drifted so far from safe, she couldn’t even hear New Cath’s warnings anymore. The voice of her conscience had faded, and then the semaphores got blurry and the smoke signals grew faint. She was adrift. With keys.
Knox, Ruthie (2012-06-11). About Last Night: A Loveswept Contemporary Romance (Kindle Locations 1541-1543). Random House, Inc.. Kindle Edition.
Definition from http://www.onelook.com/?w=semaphore&ls=a