The national emblem of Thailand is called the พระครุฑพ่าห์. The Garuda was officially adopted as the national emblem by Vajiravudh in 1911. However, the mythical creature had been used as a symbol of royalty in Thailand for centuries. Wikipedia
Adopted: Created in 1873, discontinued in 1910
Motto: Pali (in Thai script): สพฺเพสํ สงฺฆภูตานํ สามคฺคี วุฑฺฒิ สาธิกา (Sabbesaṃ saṅghabhūtānaṃ sāmaggī vuḍḍhi sādhikā)
Other elements: Mantle and the Royal regalia (Sword of Victory, Royal Staff, Royal Slippers, fan and fly-whisk)
Use: Used by the king and the government of Siam on all official documents