266th
266th is the ordinal form of the number 266, used to denote the position of an item within a sequence. In English, it is pronounced “two hundred sixty-sixth” and is appended to a noun to indicate order, as in “the 266th chapter” or “the 266th edition.”
In military contexts, ordinal numbers are commonly used to label formations and units in a sequential system.
Beyond military usage, 266th can appear in other numbering systems: as a designation in catalogs and lists
See also: 266 (number), ordinals, list of military units by number.