Exact Line Spacing Explanation

I have been looking for line spacing that is in between 1 and 1.5. After doing some investigating I found the "Exactly" option under Paragraph/Spacing. However, I am not sure I completely understand the measurement system. It states, "Line Spacing: Exactly     At: 20 pt." Does "At" refer to where it measures the line spacing from? Is "20 pt." the size of the space? How big is a point?

Thanks,

Darin 

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