See also: and Δ

U+2206, ∆
INCREMENT

[U+2205]
Mathematical Operators
[U+2207]

Translingual

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Etymology

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From the Ancient Greek capital letter Δ.

Symbol

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  1. (mathematics) An increment or change in a variable.
    x   the change in variable x
  2. (set theory) The symmetric difference symbol.
  3. (mathematics, physics) The Laplace operator.
    Synonym: ∇²

Usage notes

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  • Although this is the official encoding for the mathematical character, most math publications that apply Unicode (LaTeX publications rarely use Unicode) use simply the Greek letter Δ for convenience.

Synonyms

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English

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Etymology

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From translingual (change).

Noun

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(plural ∆s)

  1. (Reddit) An award given to someone who successfully convinces someone to change their viewpoint.
    • 2025 April, “Can AI Change Your View? Evidence from a Large-Scale Online Field Experiment”, in University of Zurich[1], pages 2, 5:
      In Figure 3, we report the fraction of comments that received a for each treatment condition. [] Meanwhile, ∆s can be awarded to any type of comment, without restrictions.