A title, in the way that we are using it here, is to be recognized for a particular skill, or accomplishment. The elevated social status is merely a by-product. It is not a rank.
A title is or can be used in conversation, to give an example of ones experience or knowledge. A title could also be used similarly on documents, and become a part of your name.
Titles are a way to detail a large amount of data, knowledge and experience into a title, in order to recognize an individual. They are used to recognize the individual for something.
Depending on the title, it could mean anything. I find it's best to ask, when there are things being said that I do not understand.
34.30“I am a high Assassin,” said Tyrtaios, turning angrily toward Decius Albus. “I have trained for years. I have ascended the Nine Steps of Blood. I do not slaughter a tethered tarsk. I am not a butcher. Kill him yourself. Do not be afraid. A child, or slave, could manage the matter!” ~Plunder of Gor - Chapter 60 Quote 30~34.13 "It would not matter much if you were an excellent swordsman, or not," said Tyrtaios. "It might take a moment longer, another parry, another thrust. My skills reach beyond excellent. I fear only two swords on Gor, that of the High Master of the Caste of Assassins, and that of an obscure warrior who, long ago, on the roof of the Central Cylinder of Ar, bested him.""Then only one," said Kurik, "for the High Master, bested, defeated, must have been slain.""No," said Tyrtaios. "He escaped." ~Plunder of Gor - Book 34 Page 551 Quote 13~34.15 It may be useful to speak briefly of the nature of a black court................ A black court, I gather, is named for the color of the caste of Assassins, which is black. The caste is sometimes spoken of, when men dare to speak of it, as the black caste, or the sable caste. In many Gorean cities it is unwelcome, even outlawed. For example, it is outlawed in Ar and in Market of Semris. Its outlawry in Ar, I gather, followed an unsuccessful attempt by an army led by Pa-Kur, a high Assassin, to seize that great city, the largest, richest, and most populous in Gor's northern hemisphere. The city it seems, was in disarray, and its Ubar challenged, following the temporary loss of its Home Stone, purloined by an unidentified tarnsman during the revels of the Planting Feast. Supposedly instrumental in the defeat of Pa-Kur and the restoration of the Ubar of the city to power was a figure known in the songs as Tarl of Bristol, which figure, as many such figures recounted in such songs, is presumably legendary. The hostile army, in some of the scrolls, is spoken of as the Horde of Pa-Kur, which disparaging epithet occurs in common parlance, doubtless reflecting the truism that history is likely to reflect the views of the victors. The outlawry of the caste of Assassins in Market of Semris may have been an independent act, or may have followed the example of Ar. In any event, it seems that "black courts" exist in a number of cities, though surely not all, either openly, as in Brundisium, or, one supposes, sometimes, where outlawed, secretly. ~Plunder of Gor - Book 34 Pages 232-240 Quote 15~ 1.2"The spies of Ar are effective," I said."More effective than the Assassins of Ar," she said."Pa-Kur, Ar's Master Assassin, was dispatched to kill you, but failed."~Tarnsman of Gor - Book 1 Chapter 8 Quote 2~1.4I noted with satisfaction that Pa-Kur, Master Assassin, proud leader of perhaps the greatest horde ever assembled on the plains of Gor, had need of Mintar, who was only of the Merchant Caste.~Tarnsman of Gor - Book 1 Chapter 11 Quote 4~3.1And when the swift living blade of Sarm was still a full yard from my throat it met the lightning steel of a Gorean blade that had once been carried at the siege of Ar, that had met and withstood and conquered the steel of Pa-Kur, Gor's Master Assassin, until that time said to be the most skilled swordsman on the planet.~Priest Kings of Gor - Book 3 Quote 1~35.5"You are unlikely to know me, kajira," said he at whose feet I knelt. "Do not be concerned. Many do not know me. Many have not even heard of me, save for brief, whispered words, spoken in private. I am Pa-Kur, of the Black Caste, the Caste of Assassins, Master of a hundred Black Courts. The Black Caste is the noblest and most essential of castes. It eschews borders and repudiates Home Stones. It knows no city as its own, and thus claims all cities. Without it, how could justice be done and wrongs righted Where law fails and judges err, what but the blade and quarrel can speak? Let insult be answered and slander avenged. The verdict of steel is sufficient and conclusive."I knew too little of Gor to understand this. I had heard of the sable caste, of the black caste, but, until this night, I had never knowingly met a representative of the caste. Do they not mingle amongst men unnoted, until the hunt is nearly concluded, until the black dagger is placed on the forehead? Certainly he who called himself Pa-Kur spoke highly of the caste. Why then, if its aim was so exalted and its ideals so high, was it so dreaded, feared, and shunned?~Quarry of Gor - Book 35 Page 303-304 Quote 4~5.13"Welcome, Killer," said the man, addressing the Assassin by what, for that caste, is a title of respect.~Assassin of Gor - Book 5 Chapter 2 Quote 13~PERSPECTIVE MATTERS
35.4"Noble leader, great Pa-Kur, confederate of beasts, Lord of the Black Caste," said Addison Steele, "the slave will be of little use, as she cannot speak."~Quarry of Gor - Book 35 Page 302 Quote 3~SPEAKER ATTEMPTS FLATTERY