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.
York Imperial and is also lop-sided. The 'Spencerville Red' is thought to be a cross between the 'York Imperial' and a crab apple. The 'York Imperial' is easily identified by its lop-sided shape. It is consistently one of the top-ten-selling apple varieties. The fruit is medium to large, and varies from an oblate-oblique shape to an oval-oblong shape, and the skins are deep red with greenish-yellow streaks and specks, as well as occasional patches of yellow or green. It can be streaked with grayish scarfskin. 'York Imperial' apples ripen in October and are harvested through December. This cultivar has a tart yet