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 Knight own "Ritterhauptmann" or Captain and kept detailed records of noble families and properties. The Imperial Knights were exempt from imperial taxes and were not required to quarter troops. Over time the title of Imperial Knight became a title of nobility rather than occupation. Many Imperial Knights even as early as the 16th century are more famous for their scholarly, artistic, or diplomatic work than their military achievements. During the demise of the Holy Roman Empire in 1803, the Knights' estates, which were generally enclaves, were seized by the great territorial states like Bavaria and Württemberg in the so-called "Rittersturm". In