The early version of the test used the letters F, A, S and the test was often known as the "FAS test". However, use of the lettersets C, F, L and P, R, W is preferable, because the two sets are matched for letter frequency.
Source: wiktionary
Letterset
Synonyms for "letterset"
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Skill to prepare polyester form overlays by transferring letters and/or numerals from a letterset to a clear polyester sheet.
Source: wiktionary
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.