---
title: kSKIndexUnknown
framework: Core Services
role: symbol
role_heading: Global Variable
platforms: [Mac Catalyst 13.0+, macOS 10.3+]
path: coreservices/kskindexunknown
---

# kSKIndexUnknown

Specifies an unknown index type.

## Declaration

```swift
var kSKIndexUnknown: SKIndexType { get }
```