θ
Theta in Mathematics
In Mathematics, the Theta symbol (θ) is commonly used. Learn how to copy and use it in your technical documents.
Unicode
U+03B8
HTML Entity
θ
LaTeX Sequence
\theta
Primary Field
MathematicsMathematics Application
Theta is the go‑to symbol for an angle, especially in trigonometry and polar coordinates, where a point is written (r, θ). It also appears as a plane‑angle measure and, in options trading, as the rate of time decay.
How to type Theta (θ)
- Fastest: click θ on the keyboard above — it copies to your clipboard, ready to paste into Word, Google Docs, email or a forum.
- Unicode: the code point is shown in the panel above; on Windows you can also use Alt‑X after the hex code in Word.
- LaTeX: use the command shown above inside math mode.
- Anywhere: because it’s standard Unicode, it keeps its exact form across apps and devices.
Frequently asked questions
Why is θ used for angles?
By long convention θ (and φ) label unknown angles in trigonometry, physics and engineering diagrams.
What is θ in polar coordinates?
The angle measured from the positive x‑axis to the point, paired with the radius r.
Write mathematical and scientific expressions
Need to pair this symbol with other operators?