Minecraft wiki entry for Lightning_Rod, associated text: According to Minecraft Live 2020, Ulraf had the idea of lightning rods when a lightning strike burned down his wooden house.[2]
In Minecraft Dungeons, there are lightning rod blocks as well. These generate on the roof of the Woodland Mansion Ancient Hunt to charge creepers.
If /item replace is used to place a lightning rod on a player's head, the item appears upside-down and to the right of their head, somewhat resembling a robot's antenna.‌[Java Edition only]