White Dragon
One of three Dragon tiles in Mahjong, often depicted as a blank white tile or with a simple rectangular border. Known as "Soap" in American Mahjong. There are 4 White Dragon tiles in a set. It stands in for zero only in hands where the NMJL card prints a "0" (such as year hands); otherwise it is simply the White Dragon (Soap).
What Is the White Dragon?
The White Dragon is one of three Dragon types in Mahjong, alongside the Red Dragon and Green Dragon. There are 4 White Dragon tiles in every standard American Mahjong set. In American Mahjong, this tile is most commonly called "Soap", a nickname unique to the American game.
Unlike the other two Dragons, which display bold Chinese characters, the White Dragon is often visually understated. Depending on the set, it may appear as:
- A completely blank white tile with no markings
- A tile with a simple rectangular border or frame
- A tile with a "P" character (from the Chinese 白, bái, meaning "white" or "pure")
The minimalist design is intentional, the White Dragon represents purity, blankness, or a clean slate. The American nickname "Soap" reportedly comes from the tile's clean, blank appearance, as if it had been "washed" of all markings.
On the NMJL card, the White Dragon is written out as "Soap" and, in certain hands, printed as 0 (zero). The key point is that the White Dragon only *functions* as a zero in hands where the card actually prints a 0, such as year hands that spell out a date. In every other hand the same tile is just the White Dragon (Soap), a normal Dragon used in Dragon groups, not a numeric zero. New players sometimes confuse the blank White Dragon tile with spare or replacement tiles that also come blank in many sets. The key difference is quantity, a set contains exactly 4 White Dragons, and any additional blank tiles are spares.
The traditional color association links the White Dragon with Dot tiles, mirroring how the Red Dragon pairs with Crak and the Green Dragon pairs with Bam.
White Dragon Strategy and the Soap Nickname
The White Dragon's distinctive blank appearance gives it a unique place in American Mahjong culture. The "Soap" nickname is so widely used that many players learn it before they learn the tile's formal name.
Strategic considerations for the White Dragon:
- The Soap-Dot connection. Some hands on the NMJL card pair White Dragons (Soap) with Dot tiles, following the traditional Dragon-suit color associations. When you see "0" on the card alongside black/dark numbers, think Soap with Dots.
- Identification challenges. The blank or near-blank design means the White Dragon can be confused with spare tiles. When setting up the game, ensure all 4 White Dragons are included in the wall and extras are set aside. During play, a White Dragon on your rack is easy to overlook if you are not paying attention.
- Tracking Soap tiles. As with all Dragons, only 4 copies exist. Keep a mental count of how many have appeared in discards and exposures. If you need a Pung of Soap and two are already visible, Jokers become essential to complete the group.
- Discard safety. White Dragons follow the same defensive logic as other honor tiles. They are generally safe to discard early, but become potentially dangerous if opponents show signs of building Dragon or honor-heavy hands. A late-game Soap discard could be the hot tile that completes someone's Mah Jongg.