One of the mysteries of the English language finally explained.
Frequently with capital initials. In the Ottoman Empire: a decree or edict issued by the government and approved by the Sultan personally by means of a handwritten note or sign, and thereby considered to be irrevocable. Also (with the): specifically the Hatti Humayun of 1856 which aimed to establish equality between Ottoman subjects regardless of faith or ethnicity.
Early 19th century; earliest use found in Oriental Herald. From Ottoman Turkish ḵaṭṭ-ı hümāyūn (Turkish hatt-ı hümâyun) from Persian ḵaṭi-humāyūn the sovereign's autograph from ḵaṭṭ, ḵaṭ + -i, suffix connecting a noun to its qualifier + humāyūn sacred, royal, imperial, (also originally) fortunate, auspicious.
hatti humayun/ˌhʌtɪ huːˈmɑːjʊn//ˌhʌtɪ huːˈmʌɪən/
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