δ
Delta in Mathematics
In Mathematics, the Delta symbol (δ) is commonly used. Learn how to copy and use it in your technical documents.
Unicode
U+03B4
HTML Entity
δ
LaTeX Sequence
\delta
Primary Field
MathematicsMathematics Application
Lowercase delta represents a very small change or variation, the Dirac delta function used in physics and signal processing, the Kronecker delta in linear algebra, and partial variations in calculus. It is the infinitesimal cousin of the capital Δ (a finite change).
How to type Delta (lowercase) (δ)
- Fastest: click δ 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
What is the difference between δ and Δ?
Lowercase δ usually means an infinitesimally small change or a special function; capital Δ means a finite, measurable change such as Δx.
What is the Dirac delta?
An idealized function that is zero everywhere except at one point, where it is infinitely tall — used to model impulses.
Write mathematical and scientific expressions
Need to pair this symbol with other operators?