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# Factorio Runtime Docs Version 2.0.77

# BlueprintSignalIcon - Runtime Docs

## BlueprintSignalIcon :: table

#### Table fields

signal | :: SignalID | The icon to use.
The icon to use.
index | :: uint32 | Index of the icon in the blueprint icons slots. An integer in the range [1, 4].
Index of the icon in the blueprint icons slots. An integer in the range [1, 4].

Concept used in

- LuaItemCommon::preview_icons
- LuaItemCommon::default_icons
- LuaRecord::preview_icons
- LuaRecord::default_icons