Unicode has no domino emoji. It has domino tiles as text symbols: 🁡 is the double six, U+1F061, and 🂓 is the same tile standing up. Every tile of a double-six set is in the table in both positions.
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How the tiles are numbered
A domino has two ends, each blank or marked with one to six pips, and a double-six set has 28 tiles. Unicode gives every tile in both orders, 1-3 and 3-1, so 49 lie flat and 49 stand up, with one tile back for each position.
Text symbols, not emoji
The Domino Tiles block was added in Unicode 5.1, in 2008. None of its characters has an emoji form, so a tile takes the color of the text around it. A device without a font for the block draws an empty box.
A double six domino emoticon is one character: 🁡 flat, 🂓 upright.
No dominoes game emoji exists; 🎲 and 🀄 are emoji of other games.
Questions and answers
Is there a domino emoji?
No. Unicode has domino tiles, yet none of them is an emoji: they are text symbols in the Domino Tiles block. The emoji of other games in the table are the game die, the mahjong red dragon and the joker.
What is the Unicode for a domino tile?
The block runs from U+1F030 to U+1F09F. U+1F030 is the back of a tile lying flat, U+1F031 the double blank and U+1F061 the double six. The standing tiles start at U+1F062.
How many domino symbols are there?
One hundred: 49 tiles and a back lying flat, and the same 50 standing up. A double-six set has 28 tiles; Unicode encodes each tile with unequal ends twice, once in each order.
Why does a domino tile show as an empty box?
Because the device has no font for the Domino Tiles block, which dates from Unicode 5.1 of 2008. The character is still there: copied and pasted to a place that has such a font, it shows as a tile.
All 103 domino tiles
Start here 7
🀰Domino tile horizontal backU+1F030. The back of a tile, which shows no pips.
🀱Domino tile horizontal-00-00U+1F031. The double blank.
🀹Domino tile horizontal-01-01U+1F039. Double one.
🁡Domino tile horizontal-06-06U+1F061. Double six.
🁢Domino tile vertical backU+1F062. The back of a tile, which shows no pips.
🂓Domino tile vertical-06-06U+1F093. Double six.
🎲Game dieU+1F3B2. An emoji of another game. The pips on a domino end are generally arranged as on the faces of a die.
Lying flat 46
🀲Domino tile horizontal-00-01U+1F032. Blank, then 1 pip.
🀳Domino tile horizontal-00-02U+1F033. Blank, then 2 pips.
🀴Domino tile horizontal-00-03U+1F034. Blank, then 3 pips.
🀵Domino tile horizontal-00-04U+1F035. Blank, then 4 pips.
🀶Domino tile horizontal-00-05U+1F036. Blank, then 5 pips.
🀷Domino tile horizontal-00-06U+1F037. Blank, then 6 pips.
🀸Domino tile horizontal-01-00U+1F038. 1 pip, then blank.
🀺Domino tile horizontal-01-02U+1F03A. 1 pip, then 2 pips.
🀻Domino tile horizontal-01-03U+1F03B. 1 pip, then 3 pips.
🀼Domino tile horizontal-01-04U+1F03C. 1 pip, then 4 pips.
🀽Domino tile horizontal-01-05U+1F03D. 1 pip, then 5 pips.
🀾Domino tile horizontal-01-06U+1F03E. 1 pip, then 6 pips.
🀿Domino tile horizontal-02-00U+1F03F. 2 pips, then blank.
🁀Domino tile horizontal-02-01U+1F040. 2 pips, then 1 pip.
Show all 103 domino tiles (82 more)
Lying flat, continued
🁁Domino tile horizontal-02-02U+1F041. Double two.
🁂Domino tile horizontal-02-03U+1F042. 2 pips, then 3 pips.
🁃Domino tile horizontal-02-04U+1F043. 2 pips, then 4 pips.
🁄Domino tile horizontal-02-05U+1F044. 2 pips, then 5 pips.
🁅Domino tile horizontal-02-06U+1F045. 2 pips, then 6 pips.
🁆Domino tile horizontal-03-00U+1F046. 3 pips, then blank.
🁇Domino tile horizontal-03-01U+1F047. 3 pips, then 1 pip.
🁈Domino tile horizontal-03-02U+1F048. 3 pips, then 2 pips.