+**156d** (pronounced "one-five-six-dee") often marks a specific [Duration](/wiki/Duration) within various systems, representing a count of 156 units. It can signify a [Cycle](/wiki/Cycle) length or a fixed interval in fields from astronomy to project management.
+## See also
+- [Time](/wiki/Time)
+- [Period](/wiki/Period)
+- [Unit](/wiki/Unit)
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