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What does AM stand for?

AM stands for Attometer (10 E^-18, one quintillionth)

This definition appears frequently and is found in the following Acronym Finder categories:

  • Science, medicine, engineering, etc.

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Other Resources:
We have 232 other meanings of AM in our Acronym Attic

Samples in periodicals archive:

Their calculations suggest that a black hole a few attometers or so across (an attometer is a nano-nanometer, smaller than a proton), with a mass on the order of a million metric tons, could provide large amounts of power for decades before shrinking to nothingness and disappearing in a final explosive poof.
I could do even better if Google allowed am as an abbreviation for attometer or fm as an abbreviation for femtometer.