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 Highness imperial houses, among many others. Archdukes of Austria from the Habsburg dynasty traditionally hold the style of Imperial and Royal Highness (), with the "Royal" signifying their status as Princes of Hungary. These styles have been abrogated but are often given out of courtesy. Some members of the royal family of Belgium descending from the Habsburgs do hold it as an official style (the "and Royal" might here possibly be read as referring as well to Belgium). Members of the British Royal Family, theoretically, as the Imperial Family of British India, could have used the title, but did not. Imperial