nundinal letter
noun
: one of the first eight letters of the alphabet used by the ancient Romans in the Sabine calendar after adoption of the seven-day week, the first seven letters being repeated consecutively in one column to designate days of the week and all eight in a parallel column to mark the recurrence of market days under an older eight-day cycle
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“Nundinal letter.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/nundinal%20letter. Accessed 23 Nov. 2024.
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