In the application, after a lot of discussion, we settled on Playback and Playing Techniques. Internally we originally referred to Playing Techniques as ‘Playing Technique Appearances’, which you may find a useful distinction. For example the words ‘mute’ and ‘con sord’ are two different Playing Technique (Appearance)s, but they have the same Playback Technique. You might also have a symbol attached to a note that means muted too. So there are several visual representations, which may depend on the instrument and the current language, but they create the same playback effect.
Internally, we refer to Articulations as properties of a note that are usually displayed above it (accents, staccato, etc). There’s quite a famous quote: “There are 2 hard problems in computer science: cache invalidation, naming things, and off-by-1 errors.”