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)
Schläfli double six the Schläfli double six is written 1230. As Schläfli showed, the double six may be constructed from any five lines "a", "a", "a", "a", "a", that are all intersected by a common line "b", but are otherwise in general position (in particular, each two lines "a" and "a" should be skew, and no four of the lines "a" should lie on a common ruled surface). For each of the five lines "a", the complementary set of four out of the five lines has two quadrisecants: "b" and a second line "b". The five lines "b", "b", "b", "b", and "b"