The Knight Kadosh is a degree rarely worked in the Northern Jurisdiction of AASR in the US, but may be found in the country's Southern Jurisdiction and in most Scottish Rite workings throughout the world. The word in Hebrew is spelled Qoph Daleth Vav Shin (QDVSh) and means consecrated or holy. It is derived from a root verb meaning "set apart".
In some versions of the degree, particularly the one used in the Southern Jurisdiction, it was thought to be anti-Catholic. The ritual I'm familiar with may have been written by the southern gentleman Albert Pike who, if reports can believed, was not entirely free of racial and religious prejudice.
The question arises whether we can learn that much from a degree written by a person of such dubious character.
The original material for the degree was taken from The Council of Emperors of the East and West, founded in France in 1801, which Pike subsequently revised considerably. In the ritual of the Southern Jurisdiction the lesson of this degree is "to be true to ourselves, to stand for what is right and just in our lives today. To believe in God, country and ourselves."
In the version with which I am familiar it is now a philosophical degree - although philosophers seem harder to find.
The mysterious ladder has remained mysterious and arguably is the most substantial content of the degree.
Nevertheless the title of the degree may have some significance as an indicator of matters not seen.
Never leave a wounded soldier lying on the battlefield. Bring every last one home. Do this work under cover of darkness, let your inner light guide you.
Our birth is but a sleep and a forgetting…trailing clouds of glory do we come from God, who is our home -Wordsworth