As a university student, I’m finding it practical to have a second structure attached to my actual project specifically for classes:
SX.C.ID
S5.4.07 - ID 7 of class 4 in semester 5 (the S to denote semester and separate it from the main system)
I go into more detail here, but it could easily be expanded to fit more semesters and classes.
In the case of teaching, I’m wondering if it’d be more practical to organize by year without the overhead of tracking semester numbers:
24.F.01 could be the first thing of fall semester 2024, or even something longer like 2402.6.02 - ID 2 of class 6 of quarter 2 of 2024.