Typically they're called "US customary units" outside of the grand old U. S. of A, who refused to adopt any sort of metric system way back in the 19th century because they were "ungodly".

Perhaps "ungodly" explains current refusal, but original reason U.S. does not use metric is pirates stole the metric standards as they were being shipped over from France.

https://www.npr.org/sections/thetwo-way/2017/12/28/574044232...