Wiktionary
notifier
n. A person or thing which notifies or provides notification.
Wikipedia
Notifier
Notifier or Notifier by Honeywell is a manufacturer of engineered fire alarm systems with over 500 distributors worldwide, and regional support operations on every continent. Notifier is headquartered in Northford, Connecticut and is a division of the Honeywell Life Safety Group.
Usage examples of "notifier".
Sisko found the notifier tag on the screen of his computer when he stepped back in from Ops deck.
Then she slipped around to sit at the desk again, and found the terminal's screen blinking with the notifier herald that indicated another message waiting for her.