# \in

The ∈ symbol (Element of, U+2208), written as \in in LaTeX math mode.

https://texform.dev/latex/symbols/in

## Metadata

| Field | Value |
| --- | --- |
| Topic | [Relations](https://texform.dev/latex/topics/relations) |
| Packages | base |
| Allowed mode | math |
| Glyph | ∈ |
| Unicode | U+2208 ELEMENT OF |
| Delimiter | No |

## Syntax

```latex
\in
```

Takes no arguments.

## Common tasks

### How to write set membership

```latex
x\in S
```

[Open in Playground](https://play.texform.dev/?input=x%5Cin+S)

### How to write an element of the reals

```latex
x\in\mathbb{R}
```

[Open in Playground](https://play.texform.dev/?input=x%5Cin%5Cmathbb%7BR%7D)

### How to write the negation of membership

Use \notin, not \not\in, when you can.

```latex
x\notin S
```

[Open in Playground](https://play.texform.dev/?input=x%5Cnotin+S)

## Usage frequency

12.86% of formulas in the measured corpus contain this entry, rank 2 of 474 entries with frequency data.

## In TeXForm

TeXForm parses this entry as a character leaf mapped to U+2208 (ELEMENT OF).