Pi in Mathematics
In Mathematics, the Pi symbol (π) is commonly used. Learn how to copy and use it in your technical documents.
Unicode
U+03C0
HTML Entity
π
LaTeX Sequence
\pi
Primary Field
MathematicsMathematics Application
The pi symbol represents the ratio of a circle’s circumference to its diameter, an irrational constant approximately equal to 3.14159. It appears throughout geometry and trigonometry (the area of a circle is πr²), in the period of trigonometric functions, and in probability — the normal distribution’s density function contains √(2π). In physics it turns up anywhere circles, waves or oscillations appear.
How to type Pi (π)
- Fastest: click π 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
Is π the same as the product symbol ∏?
No. Lowercase π is the circle constant (3.14159…). The capital Π is the n‑ary product operator used for multiplying a sequence of terms.
How do I type π quickly?
Click it on the keyboard above to copy it, or use the Unicode U+03C0, the LaTeX command \pi, or the HTML entity shown above.
Write mathematical and scientific expressions
Need to pair this symbol with other operators?