+156a often designates a specific [System State](/wiki/System_State) or a unique [Process Identifier](/wiki/Process_Identifier) within a broader scheme. It functions as a singular marker, defining a particular condition or phase in a sequence of operations or classifications. Its presence indicates an established protocol or a distinct point in a continuum.
+## See also
+- [Designation](/wiki/Designation)
+- [Classification](/wiki/Classification)
+- [Sequence](/wiki/Sequence)
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