lightning bolt

Short definition from Wiktionary

Noun

1. 1
   A single, visible discharge of lightning.
2. 2
   A conventional representation of a lightning bolt as a zigzag line.
3. 3
   A conventional representation of a lightning bolt in heraldry or in artistic depictions of thunder gods, for example as a winged and barbed torch.
4. 4
   Something that shocks or energizes, especially something that does so suddenly.