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 (automobile) were often built as soon as the styling changed, and sold over a period of some years. All 1961 Imperial Crown Ghias wore the 1960 styling front and rear, for example, and all 10 Ghia built Imperial Crowns sold during the 1965 model year were 1964s with 1965 exterior styling, and consequently had pushbutton gearshifts. At about curb weight the 1957-65 Ghia built Imperial Crowns are the heaviest standard production cars sold by an American firm since the 1930s. Throughout her husband's term as U.S. President, Jacqueline Kennedy's personal car was a Ghia built 1961 Imperial Crown with 1960 model