---
title: "Bold symbol mathematical notation"
description: "Bold symbol is a recurring research-paper notation family. Visually distinguishes a vector, matrix, or tensor from a scalar with the same base letter."
canonical_url: "https://fanout.sh/labs/math-decoder/symbol/bold-symbol"
md_url: "https://fanout.sh/labs/math-decoder/symbol/bold-symbol.md"
last_updated: "2026-08-09"
access: "public"
---

# Bold symbol mathematical notation

Bold symbol is a recurring research-paper notation family. Visually distinguishes a vector, matrix, or tensor from a scalar with the same base letter.

## Public overview

Bold symbol: Visually distinguishes a vector, matrix, or tensor from a scalar with the same base letter. Example: x is a real vector with d coordinates.

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