Symbolism, Imagery, Allegory
One of Humbert's favorite little catch phrases refers to the strange coincidences and convergences that Humbert experiences:
As for me, although I had long become used to a kind of secondary fate (McFate's inept secretary, so to speak) pettily interfering with the boss's magnificent plan. (27.85)
One of the most notable quirks is the reappearance of the number 342: it's the street number of the Haze home, the room number at The Enchanted Hunters, and the total number of hotels in which Humbert and Lolita stay during their travels. What the number ultimately signifies is unknown.