Scores come in different types or formats. The online library catalog record for an item will give you clues as to what format the item is. All score formats listed below are shelved together on the third floor of University Libraries.
A word about terminology: "printed music" is here used to refer to contemporary printed editions of music scores.
"Sheet music" usually refers to historic printed music (generally popular, but sometimes "classical") from the 19th and early 20th centuries. For more information about historic sheet music, see "What is sheet music".