Math symbols
Delta Symbol
Copy Δ or δ. Write a change below. Copy Δ or δ, or enter two values to write the change between them.
Select a symbol to copy it.
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Delta, increment, and partial are different characters
Uppercase Greek delta Δ is U+0394, and lowercase delta δ is U+03B4. Increment ∆ is U+2206. A font can make Δ and ∆ look nearly identical, but their code points differ. Use Greek delta when you need the Greek letter, and follow the notation of your document when writing mathematics.
The rounded symbol ∂ is U+2202 PARTIAL DIFFERENTIAL, not a lowercase delta. It commonly appears in partial derivatives. Copying δ where ∂ is required changes the notation; visual resemblance does not make the characters interchangeable.
Write a signed change: final minus initial
The writer uses Δx = final − initial. Moving from 10 to 15 produces Δx = 15 − 10 = 5; moving from 15 to 10 produces −5. Parentheses keep a negative initial value unambiguous when subtracting it.
This is an absolute change in the original unit, not an absolute value and not a percentage. A negative result is meaningful. The form accepts a simple variable name and numbers, not symbolic algebra. Numerical arithmetic may be rounded for display.
Keyboard shortcuts and code formats
On Windows in Microsoft Word, type the character's hexadecimal code and press Alt + X. This is a Word shortcut, not a universal browser shortcut. On a Mac, open Character Viewer and search for the character's name. On a phone, copying a character above avoids switching keyboard layouts.
Plain-text symbols work in ordinary text fields. LaTeX commands require a math environment; pasting a command into a chat does not automatically typeset it. HTML entities are for source code, not a replacement for the character in a normal message.
Sources and standards
Frequently asked questions
How do I copy the delta symbol?
Choose Δ for uppercase or δ for lowercase. The copy button places the actual Greek character on your clipboard.
Is ∆ the same as Δ?
No. ∆ is the increment operator U+2206; Δ is the Greek capital letter U+0394. They can look alike but remain different text characters.
How do I type delta in Word or LaTeX?
In Word on Windows, type 0394 then Alt + X for Δ, or 03B4 then Alt + X for δ. In LaTeX math, use \Delta and \delta.
Does delta always mean change?
No. Delta is a Greek letter and its meaning depends on context. This page's numeric writer specifically uses final minus initial; other mathematical uses need their own definitions.