Greek Letter Theta (Θήτα - Θ)


Theta is always unvoiced (as in "thin"). This letter actually used to exist in English. (So did the voiced "th", as in "father", the letter "thorn", a lower-case "d" with the upright crossed). But both letters were replaced by the "th". It's easy to understand the originof the letter. It's the tongue protruding just between the front teeth of the open mouth, as when someone says either of the "th" sounds.

"Θ" Letter in mathematics and in science

Θ represents:

  • an asymptotically tight bound related to Big O notation.
  • sensitivity to the passage of time in mathematical finance

θ represents:

  • a plane angle in geometry
  • the angle to the x axis in the xy- plane in spherical or cylindrical coordinates
  • potential temperature in thermodynamics
  • the mean time between failure in reliability engineering
  • soil water contents in soil science
  • Debye temperature

Greek words with "Θ"

θάλασσα, θερμότητα

See Also:

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