1ky
1ky is an informal shorthand for one kiloyear, a unit of time equal to 1,000 years. In scholarly writing, more common abbreviations are ky (kiloyear), kyr, or ka (kiloannum). The exact form depends on field and publication; the unspaced form "1ky" appears mainly in datasets or informal notes and is not widely standardized.
Kiloyears are used to describe long timescales in geology, paleoclimatology, archaeology, and related disciplines. For example,