https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/4024413
Jet Skis.
Though the proper noun "Jet Ski" is a registered trademark of Kawasaki, the common noun "jet ski" refers to small recreational watercraft.
The Oxford English Dictionary records the term in use in 1961 to describe the aquatic motorbike. Original public domain image from Flickr
Public DomainFree CC0 image for Personal and Business use