In the Bible, "fallen angels" typically refer to angels who were cast out of heaven due to rebellion against God. The most prominent figure among them is Lucifer, who sought to overthrow God and was subsequently expelled. This concept is primarily derived from passages in Isaiah 14:12-15, Ezekiel 28:12-17, and Revelation 12:7-9, which depict a celestial conflict. Fallen angels are often associated with temptation and evil, and they are believed to influence humanity negatively. In various theological interpretations, they represent the struggle between good and evil.

In the film "Fallen Angels," directed by Wong Kar-wai, the title refers not to specific characters but rather to a thematic exploration of lost souls and individuals dealing with isolation, love, and moral ambiguity in a gritty urban setting. The film intertwines two main storylines involving a hitman, his partner, and a woman who is caught in their world. The "fallen angels" metaphorically represents those who have strayed from righteousness and grapple with their desires and regrets.

In the context of the movie "Fallen Angels," signs of a fallen angel can be interpreted metaphorically rather than literally. These signs may include feelings of isolation, a struggle with inner demons, a life marked by violence or moral ambiguity, and a desire for redemption. The characters often grapple with their past choices, reflecting themes of lost innocence and the quest for meaning amidst chaos. The film portrays a blend of crime and existential dilemmas, showcasing the complexities of human nature and the consequences of one's actions.

In the context of the movie "Fallen Angels," the most famous fallen angel is often interpreted as Lucifer, who is traditionally depicted as a figure who was cast out of heaven due to pride and rebellion against God. In literature and various adaptations, Lucifer represents the archetype of a fallen angel, embodying themes of temptation, free will, and the struggle between good and evil. In "Fallen Angels," the title reflects the characters' moral complexities and struggles, paralleling the concept of fallen angels in broader mythology and religious texts.