Lampent is a ghostly Pokémon that appears to be a haunted lantern or street lamp. It has a black cone-shaped cap with pointed tip at the top, and a cylindrical spool-shaped black lower body with two long arms curling from beneath it. Its head appears to be a glass bulb with a blazing purple flame contained inside; it has two small glowing yellow eyes (similar to the eyes of its pre-evolution Litwick) on the outside of its glass head, and no visible mouth.
Lampent, other than its evolutions, is the only Ghost/Fire type.
Lampent is October on the Pokémon Horoscope.
Lampent is the only Pokémon in the Litwick evolution line not to have a flame/flames outside its body.
Lampent is based on a haunted lantern; more specifically, it seems to be based on a Victorian-style street lamp. The flames of this Pokémon's line are a play on the depiction of ghosts or spirits appearing as ghastly flames/lights in Japanese culture, or the legend of the will-o'-the-wisp.
It may be a combination of the words 'lamp' and 'lament', the act of grieving or mourning, as it is a Ghost Pokémon.