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In page Julius Caesar:

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Using the Latin alphabet of the period, which lacked the letters J and U, Caesar's name would be rendered GAIVS IVLIVS CAESAR; the form CAIVS is also attested, using the older Roman representation of G by C. The standard abbreviation was C. IVLIVS CÆSAR, reflecting the older spelling. (The letterform Æ is a ligature of the letters A and E, and is often used in Latin inscriptions to save space.)[citation needed]