19181981

19181981 is the concatenation of two calendar years, 1918 and 1981. It has no standard meaning on its own, but the string can appear in bibliographic identifiers, data schemas, or as a shorthand for a historical span from 1918 to 1981. In such uses, it marks a connection or a period rather than a particular event.

The year 1918 is widely noted for the end of World War I, the Armistice of November 11, 1918, and the influenza pandemic that followed. It also led to political upheavals and the redrawing of borders in Europe and beyond. The year 1981 is marked by significant political and technological developments, including the inauguration of U.S. President Ronald Reagan on January 20, 1981, and the first Space Shuttle mission, STS-1, in April 1981. The IBM Personal Computer was released later that year, shaping the rise of home and small-business computing.

As a numeric label, 19181981 is used primarily in catalogs, archives, or datasets where a compact representation of a window between 1918 and 1981 is helpful. It does not correspond to a formal doctrine, organization, or place, but rather functions as a convenient coding or stylistic device in certain contexts.