What is "RaiseYourHand"?

I the code I see things about the “raise your hand” signal. Is that some sort of heartbeat? Is there a heartbeat? Is there any relation to the handshake? It would be great if there was guide to how it all works.

What code are you talking about?
Got a link?

Yep:

I think this is the command to make the RGB LED shout rainbows so you can find one device among many.

That would be pretty cool. How do you activate it?

I think it’s a bit of an Easter Egg, so documentation is sparse. That said, it’s in the ParticleJS library, and the appropriate calls can be deduced from there:
https://docs.particle.io/reference/javascript/#signal

The command is particle nyan deviceName on/off :wink: