TDD may refer to:

Science and technology

Telecommunications device for the deaf A telecommunications device for the deaf (TDD) is a teleprinter, an electronic device for text communication over a telephone line, that is designed for use by persons with hearing or speech difficulties. Other names for the device include te ...

, a device for text communication along a telephone line *

Test-driven development Test-driven development (TDD) is a way of writing source code, code that involves writing an test automation, automated unit testing, unit-level test case that fails, then writing just enough code to make the test pass, then refactoring both the ...

, a type of software development methodology *

Time-division duplex A duplex communication system is a point-to-point system composed of two or more connected parties or devices that can communicate with one another in both directions. Duplex systems are employed in many communications networks, either to allow ...

, the application of time-division multiplexing to separate outward and return signals *

LTE-TDD In telecommunications, long-term evolution (LTE) is a standard for wireless broadband communication for cellular mobile devices and data terminals. It is considered to be a "transitional" 4G technology, and is therefore also referred to as 3.9 ...

, a 4G telecommunications technology and standard *

Transdermal drug delivery Transdermal drug delivery techniques include: * Cream (pharmaceutical), Cream * Dimethyl sulfoxide, DMSO solution * Hydrogel * Iontophoresis (using electricity) * Jet injector * Liniment * Lip balm * Liposomes * Lotion * Medicated shampoo * Ointme ...

, 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 Teniente Jorge Henrich Arauz Airport is an airport serving the city of Trinidad, Bolivia. It is the main airport and gateway to the Bolivian section of the Amazon basin. The Trinidad VOR-DME (Ident: TRI) is located northwest of the field. The ...

(IATA airport code), Trinidad, Bolivia *

Tai Nüa language Tai Nuea or Tai Nüa (; ; , ), also called Dehong Tai (; , ) and Chinese Shan, is one of the languages spoken by the Dai people in China, especially in the Dehong Dai and Jingpo Autonomous Prefecture in the southwest of Yunnan Province. It is ...

(ISO639-3 code: tdd) {{Disambiguation