> U.S. customary (the more accurate name for what’s sometimes the called the British Imperial system)
For those wondering why there is this distinction, the British Imperial units were created by the Weights and Measures Act 1824; US customary units follow the Winchester Standard of 1588.
And in a few places they're different (US measuring "cup" vs UK, US gallon, etc)
edit: ref https://www.bbc.co.uk/bitesize/articles/zfnjb7h