Here's why:
* It's a short word: Abbreviations are usually used for longer words or phrases to save space.
* Context matters: The meaning of "lessons" can vary depending on the context. It could refer to academic classes, life lessons, musical lessons, etc.
Instead of an abbreviation, you might use:
* "Lsns" (less formal)
* "Class" (if referring to academic lessons)
* "Tutorial" (if referring to a specific lesson)
Ultimately, the best way to indicate "lessons" depends on the situation and your audience.