Golden apple is a term that is typically used to refer to a specific fruit in mythology, but it can also be used as a metaphor for something valuable or desirable. If you're looking for synonyms for this term, there are a number of options available. Some good choices might include "prize," "treasure," "jewel," "gem," or "trophy." Each of these terms conveys a sense of something that is prized or coveted, whether it's a literal object or a more abstract concept. Other possible synonyms might include "ultimate goal," "holy grail," or "ultimate prize." Whatever term you choose, it should capture some sense of the value and desirability of the golden apple.