"The small, heavy lock on a girl's slave collar, incidentally, may be one of several varieties, but almost all are cylinder locks, either of the pin or disk variety. In a girl's collar lock there would be six pins or six disks, one each, it is said, for each letter of the Gorean word for female slave, Kajira; the male slave, or Kajirus, seldom has a locked collar; normally a band of iron is simply hammered about his neck; often he works in chains, usually with other male slaves" Assassin of Gor
Message collar - Comunication
Turian Message Collar
"Kamchak and I regarded one another.
"Did you note the collar she wore?" I asked.
He had not seemed to show much interest in the high, thick leather collar that the girl had had sewn about her neck.
"Of course," he said.
"I myself," I said, "have never seen such a collar."
"It is a message collar," said Kamchak. "Inside the leather, sewn within, will be a message."" Nomads of Gor
Message tube attached to a back-braceleted girl's collar
"I approached the Central Cylinder. I knelt before the guards, my head down. The capped message tube even touched the stones." (...)
She had, of course, reported to the guards at the Central Cylinder back-braceleted, with the message tube about her neck. In this way, she could not have uncapped the tube and read the message" Magicians of Gor
Plank collar
"I could see the heavy metal collar hammered about the man's neck, not uncommon in a male slave. His head would have been placed across the anvil, and the metal curved about his neck with great blows." Hunters of Gor
"Nearby there were four girls in a plank collar. This is formed from two boards into which matching semicircles have been cut. The two boards are connected and supported by five flat, sliding U-irons; when the U-irons are slid back, the collar is opened. When they are slid into place, and the two leaves are bolted together, the collar is closed. Two hasps with staples, secured with padlocks, occur, too, at opposite ends of the planks. These lock the collar. The four girls in the plank collar were kneeling, waiting for their master to conduct some business. He was of the peasants. They were nude. Their hands were tied behind their backs." Rogue of Gor
"The primary holding arrangements for women on the benches (this is in a barge), however, are not chains. Each place on the bench is fitted with ankle and wrist stocks, and for each bench there is a plank collar, a plank which opens horizontally, each half of which contains five matching, semi-circular openings, which, when it is set on pinions, closed, and chained in place, provides thusly five sturdy, wooden enclosures for the small, lovely throats of women. The plank is thick and thus the girls' chins are held high. The plank is further reinforced between each girl with a narrowly curved iron band, the open ends of which are pierced; this is slid tight in its slots, in its metal retainers, about the boards, and secured in place with a four-inch metal pin, which may or may not be locked in place" Savages of Gor
Plate collar
"Ho-Tu grinned. "Call the smith!" said he to the guard. "Plate collars!"
(...) When the smith arrived, he took, from a rack in the wall, two narrow, straight bars of iron, not really plates but narrow cubes, about a half inch in width and fifteen inches in length.
The girls were then motioned to the anvil. First Virginia and then Phyllis laid their heads and throats on the anvil, head turned to the side, their hands holding the anvil, and the smith, expertly, with his heavy hammer and a ringing of iron, curved the collar about their throats; a space of about a quarter of an inch was left between the two ends of the collar; the ends matched perfectly; both Virginia and Phyllis stepped away from the anvil feeling the metal on their throats, both now collared slave girls.
"If your training goes well," said Flaminius to the girls, "you will in time be given a pretty collar." He indicated Elizabeth's yellow enameled collar, bearing the legend of the House of Cernus. "It will even have a lock," said Flaminius.
(...) "I will decide if and when they receive a lock collar," said Sura."Assassin of Gor