salt mines = S = same-day service

salt substrate n.

[MIT] Collective noun used to refer to potato chips, pretzels, saltines, or any other form of snack food designed primarily as a carrier for sodium chloride. Also `sodium substrate'. From the technical term `chip substrate', used to refer to the silicon on the top of which the active parts of integrated circuits are deposited.

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.

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