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I'm not familiar with Orca but I am familiar with the use of bang in Max/MSP[0], in which it's used as a generic event trigger for attached objects. Objects receiving a bang message will execute their main method. The context feels similar here.

[0] https://docs.cycling74.com/max8/tutorials/basicchapter02

It seems like a general-purpose message that nodes can send to neighboring nodes, so they can be activated in response to input events, clock cycles, and so on. In other contexts you might call it a "pulse" or a "tick."

It means the ! character

edit: at least, that's what I normally see it meaning. I'm also confused about what it means here

It's Orca specific.

A bang in this context triggers the character one coordinate down and the one coordinate right of the bang character - which is '*' - and deletes itself after one tick.

I may have remembered some details wrong, it's been a while.

A bang is normally a name for a !

In the case of ORCA a bang is an activation

So a clock periodically emits a bang that can be used to trigger the synth for a simple example.