---
title: "Signal"
description: "a match with its kind, what it is about, its evidence and its rank for this brand"
section: concepts
address: /concepts/signal
contract: 0476e35e6e275db5
---

# Signal

a match with its kind, what it is about, its evidence and its rank for this brand

[figure: Signal is a fact at follows scope. The drawing shows its fields and the objects that they point at.]

| property | value |
|---|---|
| kind | fact |
| scope | follows |
| key | the catch |
| store | postgres+lake |
| family | rules_engine |



## Fields


| field | type | required | note |
|---|---|---|---|
| `catch` | `id` | yes |  |
| `kind` | [KindOfSignal](/concepts/kindofsignal) | yes |  |
| `about` | [SignalSubject](/concepts/signalsubject) | yes |  |
| `evidence` | [EvidenceRef](/concepts/evidenceref) | yes | walkable to the sentence; a signal with no evidence cannot be written |
| `rank` | `count` | no |  |
| `confidence` | `share` | yes |  |
| `independent_sources` | `count` | yes |  |
| `brand` | `id` | no |  |



## Routes that use it
No route takes or returns Signal directly. The record holds it, and the objects that point at it reach it.