Dominoes 49 glyphs, the same combinations vertically for another 49, and also a horizontal and a vertical "back" for a total of 100 glyphs. In this arrangement, both orientations are present: horizontally both tiles [1|6] and [6|1] exist, while a regular game set only has one such tile. The Unicode range for dominoes is U+1F030–U+1F09F. The naming pattern in Unicode is, by example, . Few fonts are known to support these glyphs. While the complete domino set has only 28 tiles, for printing layout reasons, the Unicode set needs both horizontal and vertical forms for each tile, plus the 01-03 (plain)
Dominoes of Emperor Xiaozong of Song (r. 1162–1189). Andrew Lo asserts that Zhou Mi meant dominoes when referring to "pupai", since the Ming author Lu Rong (1436–1494) explicitly defined "pupai" as dominoes (in regard to a story of a suitor who won a maiden's hand by drawing out four winning "pupai" from a set). The earliest known manual written about dominoes is the "(Manual of the Xuanhe Period)" written by Qu You (1341–1437), but some Chinese scholars believe this manual is a forgery from a later time. In the "Encyclopedia of a Myriad of Treasures", Zhang Pu (1602–1641) described the game