Five horizontal stripes of red, white, blue, white and red, the middle stripe twice as wide as the others. The flag name called "Thong Trairong" (thai: ธงไตรรงค์ - also referred as "Trairanga") which mean the tricolour flag.
Originally, Vajiravudh assigned this flag as a civil flag. He also stipulated that a separate flag for each government ministry be made by charging additional emblem onto the center of the flag.
Yellow flag (the King's birthday colour), the middle the depicts the Royal Cypher (ภ ป ร: ภูมิพลอดุลยเดช ปรมราชาธิราช : Bhumibol Adulyadej Paramarajadhiraja (Thai equivalent to Bhumibol Rex)), topped by the Great Crown of Victory, in between is the Thai symbol for Aum.
A national flag with the emblem of Royal Thai Navy in the center: a chakra inserted with an anchor under the Thai royal crown. The design is identical to Thai naval unit colours. Note that all Thai Army, Navy and Air Force unit colours called "Thong Chai Chalermphol" (ธงชัยเฉลิมพล).
Triranga defaced with a red disc containing dressed white elephant, facing a flagpole. Briefly, its appearance is the same as naval ensign, but both red banners of the flag contains a stanza from a Buddhist chang in Pali, written in Thai script: "พาหุํสหัส์สมภินิม์มิตสาวุธัน์ตํ ค๎รีเมขลํอุทิตโฆรสเสนมารํ ทานาทิธัม์มวิธินาชิตวามุนิน์โท ตัน์เตชสาภวตุเมชยสิทธินิจ์จํ".
War flag of Siam (World War I), Reverse
Triranga defaced with a red disc containing Vajiravudh's personal emblem. The emblem features Thai acronym "ร.ร." and Thai digit six ("๖"), both are displayed under the glowing crown. Both red banners of the flag contains the same chant in Thai script as the obverse.