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Sine (or Sin) is a trigonometric notation used in a multitude of ways, you'll learn more as you go. Sine represents the "y" coordinate for an angle on the unit circle, if you get some random number while putting a number with sine, it's usually below one or just one. This is because the unit circle has a radius of one, as I said you'll learn more as you go. Sine plays an important role in higher level math so expect to be seeing it more often.

Implied that by saying the unit circle had a radius of one and the person getting below one. It wasn't all that clear so thank you for clarifying.