Might mean (unverified): Smallest unit in data measurement.
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We found 2 dictionaries that define the word attom:

General (1 matching dictionary)
  1. attom: Wiktionary

Miscellaneous (1 matching dictionary)
  1. aTTom: Acronym Finder

Definitions from Wiktionary (Attom)

noun:  Obsolete form of atom. [(chemistry, physics) The smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons.]

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