---
title: "Sigmoid mathematical notation"
description: "Sigmoid is a recurring research-paper notation family. Maps a real-valued score smoothly into the open interval between zero and one."
canonical_url: "https://fanout.sh/labs/math-decoder/symbol/sigmoid"
md_url: "https://fanout.sh/labs/math-decoder/symbol/sigmoid.md"
last_updated: "2026-08-09"
access: "public"
---

# Sigmoid mathematical notation

Sigmoid is a recurring research-paper notation family. Maps a real-valued score smoothly into the open interval between zero and one.

## Public overview

Sigmoid: Maps a real-valued score smoothly into the open interval between zero and one. Example: Large positive scores approach one and large negative scores approach zero.

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