See also: Lightning in Pictorial Dictionary of Heraldry.
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Most often found as part of a “thunderbolt.”
Used on its own it is a Step From Core Practice (SFCP).
Lightning Bolt (1) §
Default alignment: palewise. No proper coloration.
Source: Heraldic Templates. Artist: Torric inn Björn.
Lightning Bolt (2) §
Default alignment: palewise. No proper coloration.
Source: Pennsic Traceable Art. Artist: Roana d’Evreux (attributed). Adapted by Mathghamhain Ua Ruadháin.