Navigation keys are buttons or keys on a device that help you move around or control something, like moving up, down, left, or right. They make it easier for you to navigate or find your way through a screen, menu, or document. Full definition
For those that would rather keep on - screen navigation keys at the bottom? (androidauthority.com)
The phone has capacitive navigation keys with back - lighting. (techtree.com)
Rather than have a row of navigation keys on the bottom of the display, you can use gestures to go back, go home or view the multitasking view. (pocket-lint.com)