+**21e** commonly denotes "twenty-first" in various contexts, marking position in a sequence or an era. It often refers to the [21st century](/wiki/21st_century), a period defined by rapid [Technological change](/wiki/Technology) and global interconnectedness. This numeric identifier can signify a milestone or a specific order.
+## See also
+- [Century](/wiki/Century)
+- [Timeline](/wiki/Timeline)
+- [Future](/wiki/Future)
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