A Gillette (as in the razor blade) was once a standard measurement tool for determining the strength of a ruby laser beam (used in the
late '60's), until calorimiters were developed for energy measurement. If you could focus your laser output sufficiently to
blow a hole through a double-edge Gillette razor blade, you were the proud owner of a One Gillette Laser. Gillette blades were found
world-wide with standard thickness, so any researcher, anywhere, could compare apples to apples with other researchers for determining their own laser's
power