The siao coin (Thai: à ¹Âà ¸ªà ¸µà ¹Âà ¸¢à ¸§ or à ¹Âà ¸Âà ¸µà ¸¢à ¸§) piece, or the two at coin was a fractional-denomination coin used in the pre-decimal currency system of Siam (modern-day Thailand). The siao (à ¹Âà ¸ªà ¸µà ¹Âà ¸¢à ¸§) represented a unit valued at 1âÂÂ2 of a fuang or 1âÂÂ32 of a baht, placing it among the smaller circulating denominations of the traditional baht-based system. Early siao coins were produced in the distinctive podduang (bullet money) form characteristic of Siamese coinage, while later issues transitioned to flat, struck metal coins during the 19th century monetary reforms. The siao coin remained in use until Thailand adopted the decimal bahtâÂÂsatang currency system in the early 20th century.
It is also called pai when it was a podduang(Thai: à ¹Âà ¸Â).