Theta Symbol \u03B8 Copy & Paste: Math & Greek Letter

Theta is the go-to symbol for angles in mathematics. The lowercase \u03B8 is one of the most frequently used Greek letters in trigonometry, physics, and engineering. Every theta variant is below, ready to copy.

All Theta Symbols

What Does Theta Mean?

Mathematics — Angles

The most common use of theta \u03B8 is to represent an unknown angle in geometry and trigonometry. When you see sin \u03B8, cos \u03B8, or tan \u03B8, the \u03B8 stands for the angle being measured. It is the standard variable for angles in mathematics, much like x is the standard variable for unknown numbers.

Physics

• Angular displacement: Rotation angle in rotational mechanics
• Temperature: Sometimes used for temperature in thermodynamic contexts
• Scattering angle: In particle physics and optics
• Rotational inertia: In rotational kinematics equations

Finance — Options Time Decay

In options trading, theta measures time decay — how much an option's value decreases as it approaches its expiration date. If an option has a theta of -0.05, it loses $0.05 per day, all else being equal. Theta is one of the primary "Greeks" alongside delta, gamma, and vega.

Engineering

• Heat transfer: Dimensionless temperature
• Signal processing: Phase angle of a wave
• Control systems: Angular position in servo motors

How to Type Theta on Keyboard

Windows

• Alt code: Hold Alt, type 233 for \u03B8, or Alt + 232 for \u0398 (numeric keypad)
• Character Map: Search "theta," select, copy
• Word: Insert > Symbol > Greek and Coptic > Theta

Mac

• Character Viewer: Control+Command+Space, search "theta"
• Greek keyboard: Press "q" for \u03B8, Shift+Q for \u0398

Mobile

Copy from this page or add a Greek keyboard. On Greek keyboard, \u03B8 is on the "q" key.

LaTeX Commands

HTML Entities

Quick Copy Section

All theta symbols in one place:

θ Θ ϑ ϴ

Highlight, copy, paste. That simple.