That is it is bi-stable like a sail boat that is right side up or upside down.

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Coupling the display to the bi-stable spring allows the accessory device to be easily worn in a number of convenient locations.

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Unlike other, more traditional ideas of what an iWatch could be, this patent describes a wristband that uses a bi-stable spring, similar to a snap bracelet.

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Low Power Consumption: The M3D display technology is bi-stable, meaning that the display requires no power to maintain an image, as power is only needed when transitioning from one time to another.

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Denninger asserts that monetary sovereign issuers possess not only the privilege, but the obligation, of seigniorage, which Denninger refers to as bi-directional since sovereigns have the responsibility of maintaining a stable price level during times of both economic expansion and economic contraction.

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