Equilibrium Symbol ⇌

⇌ is U+21CC RIGHTWARDS HARPOON OVER LEFTWARDS HARPOON. In chemistry it is commonly used between reactants and products for a reversible reaction or equilibrium relationship. Representative copy checks for Equilibrium Symbol include N₂ + 3H₂ ⇌ 2NH₃; HA ⇌ H⁺ + A⁻; Reactants ⇌ products; Dynamic equilibrium: ⇌. They place ⇌ in Chemical equations, Equilibrium lessons, Reaction mechanisms, Laboratory notes. The technical meaning of ⇌ on Equilibrium Symbol depends on the accompanying equation, drawing, unit convention, or engineering standard; the Unicode text does not replace that specification. This boundary keeps Equilibrium Symbol separate from lookalikes, aliases, and broader concepts. Related forms reviewed for Equilibrium Symbol are ↔ — Left-right arrow; ⇄ — Rightwards arrow over leftwards arrow; = — Equals sign. Their notes describe General bidirectional relation, Alternative paired-arrow character, Mathematical equality. None should replace ⇌ without an intent check. Before reusing ⇌ from Equilibrium Symbol, watch for Using ↔ where ⇌ is required changes the intended equilibrium symbol or introduces a different code point; Dropping part of U+21CC while copying equilibrium symbol into chemical equations; Applying the wrong convention to equilibrium symbol in equilibrium lessons; specifically, using the wrong capitalization in an element symbol. These issues matter more than small font differences. The practical Equilibrium Symbol style checks are: In chemical equations, identify ⇌ as Equilibrium Symbol and explain the exact role it performs before the reader relies on it; For equilibrium lessons, retain the sequence U+21CC; do not silently replace ⇌ with the related form ↔; When equilibrium symbol appears in reaction mechanisms, apply this convention: Preserve element capitalization, subscripts, and ionic charges; While preparing laboratory notes, compare ⇌ with ⇄ and =, then keep the version whose meaning matches the source. They cover both presentation and the encoded text ⇌. The encoded Equilibrium Symbol alternatives are decimal ⇌, hexadecimal ⇌, and CSS 21CC. Keep literal ⇌ where UTF-8 is handled correctly. Windows: In Microsoft Word, type 21CC and press Alt+X. For the equilibrium symbol entry, in other Windows apps, use Character Map or copy ⇌ from this page. For the equilibrium symbol entry, macOS: Open Character Viewer with Control+Command+Space and search for the first character name, or copy ⇌ from this page.