---
tag: N7AV0DKNHK
kind: concept
name: b□b
sources:
  - wikipedia: en:73634@r1376316324
    locator: Glossary of mathematical symbols, section Brackets > Braces
    note: adopted
    mention: wikipedia://en/73634#MH3P
    sections: [Summary]
inventory: [EM06646KA7]
---

## Summary

Sometimes used as a synonym of $(\square)$ and $[\square]$ for avoiding nested parentheses.

Set-builder notation for a singleton set: $\{x\}$ denotes the [[set|0BSJ7RQ9BW]] that has $x$ as a single element.