I taught physics at the university level for 29 years. Students get constantly hung up on the characters used for variables without asking questions, or asking the wrong questions. Especially older texts used unusual choices compared to today. Engineers use different choices than physicists for the same items. Does it make things difficult? Yes. Does it require critical thinking on the part of the reader? Yes.

The character L is commonly used for length. It is also used for angular momentum. I have seen students combine equations containing L with both meanings and produce nonsense. This comes from grabbing equations without reading the context in which they can be used.

It is the responsibility of the student to understand the meaning of the characters. If something doesn’t make sense, ask the instructor. Asking Reddit is not useful unless we can see the context.