Subscript One Symbol

A symbol from the Superscript and Subscript Symbols collection. Click the symbol or the button below to copy.

Symbol: ₁
Unicode: U+2081
HTML entity: ₁
Category: Superscript and Subscript Symbols

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19 of 45 in the superscript and subscript symbols collection

About the subscript one symbol

The subscript one is a numeric character designed to sit below the baseline, typically used in chemical formulas, mathematical expressions, and scientific notation to denote indices or sequence numbers. It belongs to the Superscripts and Subscripts block of Unicode, where it serves as a compact typographic alternative to formatting a standard digit as a subscript.

Commonly found in contexts such as molecular formulas (e.g., H₂O) or in mathematical sequences, this character is distinct from the regular digit one and is not an emoji. Its use ensures proper vertical alignment in text without relying on styling markup, making it practical for plain-text environments like scientific documents or messaging.

How to type Subscript One

Native keyboard shortcuts for each operating system — derived from the codepoint, so the steps below are always accurate.

Windows

2 options

In Word / Outlook: type 2081 then press Alt + X.
Anywhere: press Win + . to open the emoji & symbol picker, then search.

macOS

2 options

Enable “Unicode Hex Input” in System Settings → Keyboard, then hold Option and type 2081.
Or: Control + Command + Space opens the Character Viewer — search by name.