No, you aren't misreading that, it says sine. Sine is an operator which can be used to create "Sine waves," these are waves which use the unusually helpful sine operator, which is shortened to "Sin" in the editor. They look a bit like soundwaves, in theory. Also, they can make things look neato. EDIT:Had to downsize characters due to scratch's weird engine...
Credit to xxscienceboyxx for the original! Idk who made the sine operator in the first place so... 42
