19212004

19212004 is typically read as the concatenation of two calendar years, 1921 and 2004. In historical writing and cataloging, such a sequence is routinely used to indicate a date range, either as a lifespan (1921–2004) or as the span of activity for an organization, movement, publication, or project.

If read as a lifespan, it refers to an individual born in 1921 who died in 2004, and is used in biographical listings and obituaries. If read as a period, it marks a segment of the 20th century extending into the early 21st century, covering broad themes such as political upheaval, social change, technological advancement, and globalization.

In bibliographic and archival contexts, the format 19212004 helps sort materials by time frame, enabling researchers to locate sources associated with those years. It can also appear in catalog numbers, file names, or internal project codes where the numbers serve administrative purposes rather than dates.

The precise meaning of 19212004 depends on context. Without additional information, the string does not denote a single widely recognized subject, person, or work; it is best understood as a numeric representation of a span of time or as an identifier in a larger data system.