Here are some ways you could refer to it:
* Acronymic Adjective Self-Description: This is a bit of a mouthful, but it's accurate!
* Letter-Based Adjectives: This is more straightforward and focuses on the method.
* Name Adjective Game: This is playful and emphasizes the activity.
* You can also create your own name! Maybe something like "Alphabetical Attributes" or "Name-Letter Traits."
Ultimately, what you call it is up to you! Just have fun with it.