The Daystrom scale is a method of measurement of an individual's proficiency with computers. In the year 2293, six-year-old Sanara earned an impressive B-9 rating on the Daystrom scale. (TOS - Strange New Worlds II short story: "The First Law of Metaphysics")

It's possible that the A-7 computer expert rating Spock claimed in TOS episode: "The Ultimate Computer" was also on the Daystrom scale.
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