An example of backscatter unpowered wireless communications.

Source: https://investmacro.com/2023/01/device-transmits-radio-waves-with-almost-no-power-without-violating-the-laws-of-physics/

Fixed an issue causing the Melee Kickstart mod to consume Armor Charge when the player used an unpowered melee attack.

Source: https://comicbook.com/gaming/news/destiny-2-season-of-the-deep-update-patch-notes/

Once its powerful rocket ignited, the experimental aircraft streaked upward to the limits of the atmosphere, where it then glided unpowered to land on a dry lake bed.

Source: https://nationalinterest.org/blog/buzz/x-15-mach-67-plane-smashed-record-books-pieces-207380