The three Claudian letters, based respectively upon Arcadian <i>psi</i>, <i>digamma</i>, and <i>heta</i>. The first letter has not been attested in inscriptions; its form here follows a variant which <a rel="nofollow" class="external text" href="https://www.jstor.org/stable/500662?seq=6">Revilo P. Oliver (1949)</a> reports to be found in the MSS of Priscian, against the turned C which Buecheler introduced as an emendation to the MSS.
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