call button

noun4

1. •
   A button used to request assistance.

   • Their feeling, anachronistic as the servants’ call button in their dining room, is that if you don’t have the money for something, you don’t buy it. — 2008
2. •
   A button used to request some form of mechanical service.
3. •
   A button used to request a walk signal at a pedestrian crossing.
4. •
   A button used to summon an elevator.

   • No more staring at closed elevator doors, repeatedly pressing a call button in frustration. — 2000