: What is S/P in "Tax Deduction S/P"? This may be an unusual question, but I have a plugboard labeled "Tax Deduction S/P" for an IBM 402 accounting machine from the 1950s. This must have been used to process records on punched

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What is S/P in "Tax Deduction S/P"?
This may be an unusual question, but I have a plugboard labeled "Tax Deduction S/P" for an IBM 402 accounting machine from the 1950s. This must have been used to process records on punched cards to generate a tax deduction report. But what is "S/P"? Is this an accounting term?

Edit: Michael C figured out that it stands for "summary punch", but here's a photo for the curious:

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