tap-alert

2. A setting that makes a device vibrate gently to tell you something.

Turn on tap-alert so your phone buzzes softly instead of ringing.

3. A quick touch signal used to get someone's attention.

The coach gave a tap-alert on the player's shoulder to swap positions.

4. A warning that arrives as a light touch rather than a sound.

The app sends a tap-alert when the bus is almost at your stop.