it's actually NOT symbol
i would say it's either metaphor or personification. personally, try personification because it is a TYPE of METAPHOR in which NONLIVING or NONHUMAN things are given HUMAN CHARACTERISTICS OR ABILITIES.
stars, love, brotherhood?
a metaphor is a comparison of two unlike things that does not use comparison words, one thing directly represents another
honestly up to you, it could be either but i'm leaning more to personification...