Barticle wrote:
I noticed that some sets had a dice with dragon symbols on. I´ve found a pic of some - see below.
Does this serve a purpose in any version of mahjong or do the red and green dragon symbols just fill the two blank sides of the wind indicator dice?
I have been playing mahjong for about 30 years ... mostly Chinese mahjong until recently.
Chinese Mahjong

Traditionally these dice were held in a disc with a square slot in it for indicating both the wind of the round and the dealer.
At the beginning of each full round you would place the die in the holder with the prevailing wind facing up.
The red and green dragon sides are just ornamental and used to fill up the blank sides. These dragons were chosen for their "lucky" connection.
In the last few years the discs have been dropped by a number of manufacturers and you start to see just the dice.
These dice have started to appear on ebay as part of a set with regular dice (often shown with a wind or dragon on the "1" spot) for determining the wall split.
Riichi/Reach Mahjong

Reach uses a flat square disc (Matsuoka) showing East on the front and South on the Reverse.
If you have a chinese set, you can drop the seasons/flowers and use the east/south faces from the die.
Types of Indicators that you may come across
1. Wind Indicator Discs from an Traditional American Mahjong Set
2. Bettor from an American Mahjong Set
3. Traditional Chinese indicator
4. Wind Indicator from a Modern American Mahjong Set
5. Japanese Wind Indicator Matsuoka used in Riichi/Reach
And Finally...
You may come across Yakitori markers (Tessera). These are used in Japanese mahjong (incl Riichi). These are not in the offical rules but have become common place. Each player has one and it is placed on the table. Once a player wins a game they flip over the marker. At the end of the game the markers are examined and any player who has failed to turn over their Yakitori has to pay a forfeit!