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> "what is a signal?"

it's another word for event

Signals have dependencies and subscribers. It's a value and publisher and subscriber if you want to be more correct.

a signal is not a single event but rather a stream of events at given timestamps

(or, if you wish, a stream where you have an Option<Event> at each timestamp)

I googled this and got a few different answers, but not this one. Is there a particular implementation you’re referring to?

Alien, Reactively, TC39 are all about the core semantics of signal, computed, effect. Much of the rest is implementation details. https://dev.to/this-is-learning/the-evolution-of-signals-in-... is a good intro.

this is how signals are described in the functional reactive programming world. here is the paper by the guy http://conal.net/papers/push-pull-frp/push-pull-frp.pdf

I think your confusing signals with observables