From Canadian inventor P. L. Robertson (1879-1951).
- (chiefly Canada) A type of screwdriver having a square tip, designed to drive a Robertson screw.
1963, Alonzo Wass, Building construction estimating:
- The Robertson-head screw has a square hole in the head, made in three different sizes, and must be driven with a special Robertson screwdriver.
2002, Mark Kearney, Randy Ray, I Know that Name!: The People Behind Canada's Best-known Brand Names from Elizabeth Arden to Walter Zeller:
- The Robertson screwdriver is among the tools found at hardware stores and building supply outlets across Canada.
2007, William S. Peckham and Michael C. Hammar, Never Hang Wallpaper With Your Wife: Decorating and Renovating From a Guy's Point Of View:
- Robertson screwdrivers have colour-coded handles, to make it easy to determine which size you will require.