TDD may refer to:
==Science and technology== Telecommunications device for the deaf, a device for text communication along a telephone line Test-driven development, a type of software development methodology Time-division duplex, the application of time-division multiplexing to separate outward and return signals LTE-TDD, a 4G telecommunications technology and standard Transdermal drug delivery, a method of delivering drugs through the skin and into the bloodstream
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).