Will-o'-the-wisp
In folklore, a will-o'-the-wisp, or will-o'-wisp (Latin: ignis fatuus, "foolish flame"), is an atmospheric ghost light seen by travellers at night, especially over bogs, swamps, or marshes. The phenomenon is known in the United Kingdom by a variety of names, including jack-o'-lantern, friar's lantern, and hinkypunk, and is said to mislead and/or guide travellers by resembling a flickering lamp or lantern.