I'm always looking to communicate font software / encoding to non-type people. The objective is to differentiate "font software" from an "image of lettering", clearly and quickly with minimal jargon. The term "User Interface" (UI) enables a quick analogy to the visual setting underlying software in a phone or an app, which most people are familiar with. But, is it fair to describe the typeface design as the UI of the font software?
I initially got the idea from reading this passage:
‘a book can be considered a user interface to its content… a technical research paper can be seen as a user interface, that to succeed must take account of its intended user community…almost anything can be seen as a user interface; doing so will highlight certain issues of design and representation that might otherwise remain obscure,’ – GOGUEN, J., ‘An Introduction to Algebraic Semiotics, with Applications to User Interface Design’, in Computation for metaphors, analogy and agents, ed. by C.L. Nehaniv, LNAI, 1562 (Berlin: Springer, 1999), pp. 242–91