I take it you’ve heard of the ‘jet set’, the ‘in crowd’, the ‘lanyard classes’? It’s the sort of shorthand expression coined in English to describe people of a particular bent. In this case, people who champion the cause of Metrification. A sub set of the whole world bar America and Britain, usually found decrying the use of furlongs in horse racing, when 201.2m is much more accurate, and dobbing-in butchers for selling sausages by the pound (yes, I know it’s changed). Related to people who only want Welsh language place name signs in Wales, and unrelated to the programming crowd who enjoy the use of the ‘firkin/furlong/fortnight’ system of measurements.