This is from the Surinach concerto? Any time you see an arrow pointing up or down, it means the highest or lowest note(s). The diamond shape probably means a cluster. The squiggle after it is a graphical representation of an indeterminate glissando, I would guess. In this case, obviously the individual notes are not as important as the overall gesture, and this is very common in 20th century music. I am not familiar with the Surinach concerto much, so I will go back and have a listen.