Label in Name requires that when a button or link shows visible text, an accessible name computed for assistive technology (such as an aria-label) must contain that same visible text. A button that visually reads Submit Order but carries an accessible name of just Submit breaks this rule.
This matters because people using speech-recognition software, such as Dragon NaturallySpeaking, activate controls by saying the visible label out loud. If the accessible name does not match, the voice command fails even though the sighted instruction looked correct.