Imperial units commonly used units for length are (li), (tseung/cheung), (tsek/chek), (tsun/chun), (fen/fan) in descending scale order. These units are now rarely used in daily life, the imperial and metric systems being preferred. The imperial equivalents are written with the same basic Chinese characters as the Chinese system. In order to distinguish between the units of the two systems, the units can be prefixed with "Ying" () for the Imperial system and "Wa" () for the Chinese system. In writing, derived characters are often used, with an additional (mouth) radical to the left of the original Chinese character, for writing imperial units.
Imperial College Union (representing all postgraduate students) also became a constituent union. The Silwood Park Union operates largely independently from the overall Union but has no part or full-time sabbatical leadership. Imperial College Union has a large number of student-led clubs, volunteering projects and societies (known as CSPs), with over 400 in total. Funding for CSPs at Imperial College Union is significant, taking up a sizeable portion of the Union's annual subvention provided by Imperial College London, though many clubs supplement this with sponsorship from outside of the Union. CSPs at Imperial College Union are administered by the Clubs, Societies' and Project Board,