'Sic' is Latin for 'thus,' the meaning in quotations is "no really, what I just wrote." So here it's "actually billions, that's not a mistake"; in a quote with

'Sic' is Latin for 'thus,' the meaning in quotations is "no really, what I just wrote." So here it's "actually billions, that's not a mistake"; in a quote with incorrect spelling it's "this is the way it appears in what I'm quoting, it's not my mistake."