Tan

Tan can mean several things:

tan + nak + ra = tangra
tan is shorthand in mathematics for the tangent trigonometric function.
Tanning is the process of making leather from hides.
Tan is ground oak bark used in tanning leather.
Sun tanning is the darkening of skin by exposure of the bare skin to sunshine.
Tan is a Chinese family name 譚,谭,覃,談,郯,檀 (in Mandarin) or 陳 (in Hokkien, Teochew or Taishanese). Tan can also be spelled as Tam (in Cantonese) or Hom, Tom or Ham (in Taishanese).
- See also Amy Tan, Alan Tam, Tam Kung, Patrick Tam, River Tam, Roman Tam, Simon Tam et al.
Tan is a character in the Fusion comic book.
The color tan.
Tan, or Dān (聃), is the posthumous name of Lao Zi (Lao Tzu).
Tan is a Japanese diminutive title
Tan means two in the traditional British Sheep Counting (see Yan Tan Tethera)

TAN is short for the Dutch Robot Wars machine Tough As Nails.
TAN (banking), an acronym for TransAction Number in electronic banking
TAN (from the history of neuroscience) is the name of a well-studied patient who suffered brain damage to his left temporal lobe, leaving him with severe language deficits, and the ability to only speak the word "tan."