I don't have sufficient context to write an accurate overview. The phrase "Category:User vi-2" suggests it's a Wikimedia category related to Vietnamese language proficiency levels, but without explicit information about what "vi-2" specifically denotes or how it functions on Wikimedia sites, I cannot provide the accurate, factual overview you've requested.
AI-generated from the Wikipedia summary — may contain errors.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).