What does this purple node mean, and why I can't find it in UE5

[neatpolygons]

Hey all,
I’ve been following an RnD blog about a custom shader and I stumbled upon this node;

I couldn’t understand what it does or how I can replicate it, or integrate it in case it’s built in the engine, can anyone help?
The blog post: https://cyn-prod.com/stylized-paint-shader-breakdown

Thanks a bunch <3

[ClockworkOcean]

It’s not a real node, it’s a reroute node

Material Named Reroute Unreal Engine 5

[neatpolygons]

Thank you!