Ku Klux Klan (KKK) nomenclature has evolved over the order's nearly 160 years of existence. The titles and designations were first laid out in the 1920s Kloran, setting out KKK terms and traditions. Like many KKK terms, this is a portmanteau term, formed from Klan and Koran.

The sources of the rituals, titles and even the name of KKK may be found in antebellum college fraternities and secret societies such as the Kuklos Adelphon. Earlier source material, however, states, "The ceremony of initiation was borrowed from some of the features of the introduction of candidates of the long defunct Sons of Malta and other like societies, and was calculated to, and did provoke, much amusement for most of those, if not all, who were present," according to the 1907 Cyclopedia of Fraternities. J.C. Lester, one of the original members of the group, stated that the Klan rituals were "modeled on and embraced the leading features of the rituals of an order which has long been popular in many colleges and universities under various names" such as the Sons of Confucius or Guiasticutus but always styled Ancient and Honorable and Mirth-Provoking. Walter L. Fleming stated in a footnote to Lester's text that the contemporary (early twentieth century) Southern college fraternity that most nearly mirrored the early Klan was "known as Alpha Sigma Sigma" and the institution of snipe hunting. The original prescript of the Ku Klux Klan was adopted by a convention in Nashville, Tennessee in April 1867. A slightly revised edition appeared the next year.

In both prescripts there were four levels or "departments" of organization, above the basic level:

In the first prescript each officer is given the power to appoint Deputies to organize Realms, Dominions, Provinces and Dens until the latter can elect their own officers. The Grand Wizard was to be elected by a majority of Grand Dragons, and each lower level was elected by a majority of the next lower level of officers (Dragons were elected by Titans, Titans were elected by Giants etc.), as soon as three units had been formed at each level (three Dominions within a Realm for Grand Dragon, three Provinces within a Dominion for Grand Titan, etc.). In the second prescript each officer appoints the lower officer with the approval of his superior.

The Dens were the basic level of organization for the Reconstruction Klan. In the original prescript, its chief officer was the Grand Cyclops, who appointed two Nighthawks, a Grand Turk, a Grand Sentinel, Grand Magi and a Grand Ensign in addition to his Grand Scribe. The Grand Cyclops, Grand Exchequer, Grand Magi (second officer) and Grand Monk (third officer) were elected by the body politic of the dens, identified as Ghouls. In the second prescript the Grand Ensign is dispensed with, while the Grand Exchequer was appointed by the Grand Cyclops, who was now appointed by the Grand Giant. Only the Grand Magi and Grand Monk were elected by the Ghouls.

The exact function of these officers and the meaning of the titles varied. The two Nighthawks have been identified as couriers. The Grand Sentinel was in charge of the "Grand Guard", an organization which is not otherwise elaborated upon in the prescripts, but apparently served as the Den's security detail. The Grand Turk was the den's "executive officer" and was charged with informing Klansmen of "all informal or irregular meetings" and helping the Grand Cyclops and the Grand Magi maintain the "control and government" of the Den. The Grand Ensign's job was to take care of the Klan's flag.

The organ for initiation into the Klan was called the Investigating Committee, composed of the Grand Cyclops, Grand Magi and Grand Monk. Upon the nomination of a new member by a current member, the committee would investigate the candidate's "antecedents and his past and present standings and connections" and would then pronounce the candidate "competent and worthy" to become a member. The Grand Turk would escort the candidate to an "outpost" where he would question him and administer a preliminary oath. After this the Grand Turk would conduct the candidate to the Den, where the Grand Cyclops would administer the final oath. The second prescript elaborates that the candidate must have his left hand on the Bible and his right hand toward heaven and includes a ten-point "interrogation" that the candidate must answer satisfactorily in order to proceed with the final oath. The questions asked included: "are you now or have ever been a member of the Radical Republican Party, Loyal Leagues or Grand Army of the Republic? Did you fight with the Union Army during the Civil War? Do you believe in Negro equality?"

A system of "judiciary" organs was created in each prescript. In the first the judiciary was divided into a Grand Council of Yahoos, to try officers of the Klan, and a Grand Council of Centaurs to try regular Ghouls. In Art. IV Sec. 4, the Grand Giant is charged with conducting the Council of Yahoo, but Art. VI Sec. 2 states that the council will be composed of officers of the equivalent rank as the accused and presided over by an officer of the next higher rank. A trial of the Grand Wizard would be held by a meeting of all the Grand Dragons, the most senior Grand Dragon presiding It is unclear if these tribunals were ever functional.