19562009

19562009 is most often encountered as a compact representation of a time interval spanning the years 1956 through 2009. In published works and datasets, the notation denotes the inclusive range of years that a study, archive, or collection covers. The lack of a hyphen can indicate a concatenation used in file names, accession numbers, or catalog codes, but in plain text it generally refers to a date range when context is provided.

Historically, the interval covers substantial developments: postwar reconstruction in Europe and other regions, the height of the Cold War, decolonization in the 1950s and 1960s, the technological and digital revolutions beginning in the 1960s and accelerating through the 1990s and 2000s, the rise of personal computing, the internet, and globalization; socio-political shifts including civil rights movements, economic reforms, and major geopolitical events. The end year, 2009, marks the late-2000s global financial crisis and the transition to more digital and networked societies in many areas.

As a data label, 19562009 might frame a longitudinal study, archival research, or a historical dataset where every year in that range is assumed to be included. If precise bounds are needed, authors often rewrite as 1956–2009 or 1956 to 2009 to avoid ambiguity.