DCLXI
DCLXI is the Roman numeral for the number 661. In Roman numerals, the letters D, C, L, X, and I represent 500, 100, 50, 10, and 1 respectively, and they are combined to form 661 (500 + 100 + 50 + 10 + 1).
As a calendar designation, DCLXI denotes the year 661 in the Anno Domini or Common Era system,
In modern usage, DCLXI can appear in scholarly texts, inscriptions, or cataloging systems as a numeric marker.