∆ U+2206,∆ INCREMENT ←∅ [U+2205] Mathematical Operators ∇ → [U+2207]

From theAncient Greek capital letterΔ.

∆

1. (mathematics) Anincrement or change in avariable.

   ∆x   the change in variablex

2. (set theory) Thesymmetric difference symbol.
3. (mathematics, physics) TheLaplace operator.

   Synonym:∇²

• 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 letterΔ for convenience.

• Δ

Fromtranslingual∆(“change”).

∆ (plural∆s)

1. (Reddit) Anawardgiven to someone whosuccessfully convinces someone to change theirviewpoint.
   • 2025 April, “Can AI Change Your View? Evidence from a Large-Scale Online Field Experiment”, inUniversity of Zurich‎^[1], pages2, 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.

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