plural user interfaces
Definition of user interface
: software that is designed to allow a computer user to interact with the operating system of a machine or system (such as by selecting presented options or entering text commands)
Likewise, the user interface is remarkably unintuitive, requiring a whirlwind of relentless mouse clicking to move, talk, touch, look, or manipulate onscreen objects.— Scott A. May … a new user interface he vows will change the way people use computers. — InfoWorld
especially
: graphical user interface
— abbreviation UI
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Merriam-Webster unabridged
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Time Traveler for user interface
The first known use of user interface was in 1967
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