AC3 or AC-3 may refer to:
==Science and technology== Dolby AC-3, Dolby Digital audio codec AC-3 algorithm (Arc Consistency Algorithm 3), one of a series of algorithms used for the solution of constraint satisfaction problems (35414) 1998 AC3, a minor planet AC-3, an IEC utilization category
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).