What is “function*” in JavaScript?

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In this page I found a new JavaScript function type:

// NOTE: "function*" is not supported yet in Firefox.
// Remove the asterisk in order for this code to work in Firefox 13 

function* fibonacci() { // !!! this is the interesting line !!!
    let [prev, curr] = [0, 1];
    for (;;) {
        [prev, curr] = [curr, prev + curr];
        yield curr;
    }
}

I already know what yield, let and [?,?]=[?,?] do, but have no idea what the function* is meant to be. What is it?

P.S. don’t bother trying Google, it’s impossible to search for expressions with asterisks (they’re used as placeholders).

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