There are many, many descriptors for possible ko situations around:
Let,s take the 'Newly encountered terms' from the Chinese Go Terms-page 多元劫 - Bill: This seems to refer to some kind of multiple ko that is a theoretical possibility. 多元劫 is a multiple ko with more than three or four kos.
辘轳劫 - ... mean any multiple ko, with the implication of non-stop ko fighting. (John F. Bill): the historical one is a windlass ko, a quadruple ko, made up of two discrete double kos. ... not really a term, just a piece of description.
套劫 - ... any two stage ko.
unkx80:
Both 先手劫 and 后手劫 are always in reference to a player.
先手劫 - a ko in which the player makes the first capture;
后手劫 - a ko in which the opponent makes the first capture.
Therefore, 黑先手劫 is the same as 白后手劫,
have to do with being the attacker or defender in a ko.
装劫 is a move that threatens to open a ko in the next move. Similarly,
装倒扑 is move that threatens a snapback in the next move.