TDD

TDD may refer to: Template:TOC right

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

Other uses

• Transportation development district, a special-purpose district created in some US states
• Teniente Jorge Henrich Arauz Airport (IATA airport code), Trinidad, Bolivia
• Tai Nüa language (ISO639-3 code: tdd)