+**23d** often marks the [twenty-third](/wiki/Twenty-third) position within a sequence or system. It can signify a specific day, a [unit identifier](/wiki/Unit_Identifier), or a point of particular note in a larger structure.
+## See also
+- [Ordinal Number](/wiki/Ordinal_Number)
+- [Sequence](/wiki/Sequence)
+- [Designation](/wiki/Designation)
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