tab

A key on a computer keyboard used for indentation or navigating between fields.

"Press the tab key to indent text."

A small flap, loop, or tag attached to something for gripping or identifying.

"Pull the tab to open the can."

A bill for drinks or food, especially in a pub or restaurant, to be paid later.

"Can I pay my tab now, please?"

To provide something with a small flap or mark it with a tab for identification.

"Please tab the important sections."