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What does A stand for?

A stands for Angstrom (should be written with Å; unit of length)

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

  • Science, medicine, engineering, etc.

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Samples in periodicals archive:

The wavelengths are measured in Angstroms (Ea) and each wavelength is color coded.
This video from NASA's Solar Dynamics Observatory shows the flare in a blend of two wavelengths of extreme ultraviolet light: 171 Angstroms and 304 Angstroms, colorized in yellow and red, respectively.
The Angstrom V-950 is a laboratory type spectrometer that can be set-up to analyze and certify virtually any type of foundry metal.