How do you define real estate as a stream of income?

[Craig Moore]

Hi BP,

I have a pretty simple question as I'm planning out my future as an entrepreneur. AVG Millionaire is said to have over 7 (or several depending on volume) streams of income. I was wondering, is real estate investing in itself ONE stream or is it an umbrella term for multiple streams? For example, when making a list of your streams of income is it right to say that real estate is your only one even though you may have 7 properties (7 streams)? I would like some clarity on that. If you have 7 houses that's technically 7 streams, but it only falls under one category (REI), so in trying to create streams, would you go by how many categorical incomes you have or ACTUAL income streams?

Thanks,

EDIT: I posted this in general real estate investing to no avail and figured I would try it here. Sorry in advance for the repost!