SSDD

Look up SSDD in Wiktionary, the free dictionary.

SSDD is a 4-letter initialism that could refer to:

Single Sided, Double Density, a floppy disk format
System/Subsystem Design Description in accordance with MIL-STD-498, aka "System Segment Design Description" or "System Segment Design Document"
"Same Shit Different Day", a figure of speech

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