UAV Propellers
"UAV" stands for Unmanned Aerial Vehicles, commonly referred to as drones.  They have been used for a variety of purposes, including target drones, weather information, aerial photography ,etc.  The Northrop KD2R5 is one example with further information here.
Common manufacturers include U.S. Propellers and Sensenich.
Usually not difficult to identify as designed for UAV because of their size, but specific application may be difficult to determine.  Sensenich does have a section of its web site devoted to these props and an option to be placed on their mailing list.