Lever that sticks out under the toekick on a vanity sink base cabinet, that opens the cabinet doors.
Basically so you can put a trash can under the sink and access it hands-free.
In other words, a cabinet that opens and closes with the same mechanism as a step-to-open trash can, but without the trash can taking up space in your small bathroom.
You’ve got some floss to toss, no need to touch your cabinet door handle just step down on the lever, toss the floss in the wastebasket, release foot and the door closes again.