It has another name, called the “G” clef, because the line that goes through the swirly part of the treble clef (2nd line) is going to house the G note, but not just any G on the piano. It is specific to the G above middle C. See the picture below of the notes on the 5 lines.
The five lines that the treble clef rests on is called the staff. A staff is made up of 5 lines and 4 spaces.
The notes we will learn will either be line notes (with the line going directly through the note) or space notes (where the note is found between the lines).
These four notes, F-A-C-E lie in the spaces between the lines and are considered “space” notes. Sometimes space notes are placed above the top line, or line 5 or are placed just below the first line, or line 1. These would be also considered space notes.
The whole piano’s keyboard is designed with a repeating pattern of A-B-C-D-E-F-G on the piano keys and on the staff. Each note in the alphabet is patterned line, space, line and space.
For example starting from E in the picture above, E is a line note, F is a space note, G is a line note, A is a space note, and B is a line note – thus the note pattern of line, space, line, space etc. as you climb up toward the right end of the piano.