---
title: kIOPlatformSerialNumberKey
framework: IOKit
role: symbol
role_heading: Global Variable
platforms: [iOS 16.0+, iPadOS 16.0+, Mac Catalyst 13.0+, macOS 10.3+, visionOS 1.0+]
path: iokit/kioplatformserialnumberkey
---

# kIOPlatformSerialNumberKey

## Declaration

```swift
var kIOPlatformSerialNumberKey: String { get }
```