The singular Greek form of a diptych, referring to a two-paneled folding tablet used for writing, religious images, or official records.
From Greek 'diptychos,' meaning 'folded in two,' with '-on' as a grammatical ending. The term preserved the original Greek case inflection.
Byzantine emperors carried diptychons to document treaties and laws—they were the ultimate portable filing system before paper became cheap, combining security with status.
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