MUSIC THEORY PLEASE HELP: does anyone know what this means? (for context, I am a percussionist, and this is the first time I ever saw these two lines in the middle of a measure, help???)

i dont really know what you want to draw but what about a fish? ?

if you are asking for suggestions?

including the octave, the answer would 8 notes in a major scale with one note being played twice. ex) c major scale includes: c, d, e, f, g, a, b, c

notice that c is played twice

however, if you were to ask me how many different notes are in a major scale- the answer would be 7.