Starfleet Item Identification Number

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Starfleet Item Identification Number or SIIN, is a ten-digit code that identifies each item of supply which—along with the the Federation Supply Classification Group—make up a specific Federation Stock Number or FSN.

The SIIN alone uniquely identifies an individual item of supply within the Starfleet Codification System (SCS).


The first three numbers of the SIIN (shown in orange in the diagram above) represent the Federation Codification Bureau Code. This code identifies the planetary or Federation organization that entered the item into the supply system. The remaining seven digits (shown in green) are sequentially assigned and serve to individually identify each item in the SCS.