lettered

/L EH1 T ER0 D/
verb
  1. 1

    To print, inscribe, or paint letters on something.

  2. 2

    (scholastic) To earn a varsity letter (award).

adjective
  1. 1

    Marked with letters.

  2. 2

    Literate (able to read writing in letters).

  3. 3

    Educated, especially having a degree (entitled to put an abbreviation such as BS, MA, PhD, MD after a signature).

Source: https://en.wiktionary.org/wiki/letter, https://en.wiktionary.org/wiki/lettered