What does NOS stand for?

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Not Often Satisfactory

Nation of Saints

National Ocean Survey

Fascene, Nossi-Be, Madagascar

Nitrous Oxide Sticker

nitrous oxide sedation

nitric oxide synthase;

New Old Stock

NOS is an abbreviation for "new old stock" (NOS) auto parts. The letters stand for things that are usually very old but have never been sold to the public before.

Normally Open Switch

NOS stands for Normally Open Switch. It is a type of switch used in electrical systems. When the switch is in its normal position (not pressed or not activated), the circuit is open, so no electricity flows. When the switch is pressed or turned on, it closes the circuit and allows the electricity to pass through.

This kind of switch is common in buttons, machines, and control panels. For example, when you press a doorbell, the switch closes the circuit only while your finger is on the button. After you release it, the circuit opens again. This makes NOS useful for short and controlled actions.