"Mark the interface" is a common phrase used in the world of programming, where it refers to leaving a notation or tag on the user interface of a software or website to signify a certain action or feature. There are many synonyms that can be used to describe this process, such as "labeling the interface", "tagging the UI", "annotating the layout", "signaling the design", or "noting the interaction points". All of these phrases convey the same idea of highlighting certain elements of a user interface to help users navigate and understand the software or website more easily. By using different synonyms for "mark the interface", programmers can add variety to their vocabulary and express their ideas more precisely.