The fly symbolizes more than just annoyance; it can represent 'decay' or a 'minor flaw.' Like the English expression 'a fly in the ointment,' it can be used metaphorically to describe a small imperfection in an otherwise perfect situation.

In Western culture, the fly is also seen as a symbol of 'evil' or 'chaos,' as in the title of the novel 'Lord of the Flies.' On the other hand, in the scientific community, it can signify an important research subject, thanks to the 'fruit fly' which has made great contributions to genetics research. Thus, the fly emoji has many faces, from filth to profound symbolism and scientific importance.