The US government is not consistent in the terms that it uses. The term 'inch-pound' appears to be common in the top level documents.
Federal standard 376B 1993 = 'inch-pound'. Metric conversion act 1975 as amended to 1988 = 'English system' Omnibus trade and competitiveness act = 'traditional systems' Savings in construction act = 'inch-pound' NIST handbook 13 = 'inch-pound' FPLA = 'inch/pound' and 'customary inch/pound' (it also has the bizarre term 'SI metric') UPLR = 'inch-pound' and 'customary inch-pound' The UPLR and FPLA both make the mistake of using two terms for the same thing. They don't agree on whether to use a '/' or a '-'. Google results and search terms: 4 american-customary .gov 7 inch-foot-pound .gov 19 non-metric-unit .gov 33 foot-pound-second .gov 85 customary-unit .gov 127 imperial-unit .gov 158 british-unit .gov 238 non-metric-units .gov 285 british-units .gov 470 american-units .gov 545 american-unit .gov 586 english-unit .gov 675 customary-units .gov 958 US-customary .gov 1080 imperial-units .gov 1260 inch-pound .gov 1690 english-system .gov 12800 english-units .gov
