1000s

What Roman numeral might you find in the cornerstone of a building built in the year 2000? MM – the mark of the new millennium, a move from the 1000s to the 2000s.

Source: wiktionary

The current four-phase American cycle started in the days immediately following World War II with the First Turning of the Millennial Cycle, so named because it would bridge America from one millennium (the 1000s) to the next (the 2000s).

Source: wiktionary

Only instead of cobwebs, my distraction was thoughts about the coming new millennium—the 2000s.[…]Supported by the reappearance of the decade-number 1, during that decade, the decade just finished, we saw the waning masculine-energy of the 1000s doing all it could to hang on to its power and dominance.

Source: wiktionary