The Greek noun/adjective antitupon means antitype, counterpart, or a copy corresponding to an original. Appearing twice in the New Testament (Hebrews 9:24 and 1 Peter 3:21), it is the technical term for biblical typology — the correspondence between OT shadow and NT fulfillment.
Antitupon is the key term in the hermeneutical framework of biblical typology. A tupos is the original pattern or type; the antitupon is the corresponding reality. Hebrews 9:24 uses the word to explain that the earthly tabernacle was 'a copy and shadow of what is in heaven' — the antitupon of the true heavenly sanctuary. Christ entered not the earthly copy but the true sanctuary, heaven itself, to present His blood before God. In 1 Peter 3:21, baptism is called the antitupon of Noah's flood — not a mere symbol but a corresponding reality: as the flood saved Noah through water, baptism now saves through the resurrection of Jesus Christ. The theology of antitupon teaches that the entire OT is a divinely structured preview of Christ — every sacrifice, every priest, every temple, every prophet pointing forward to its ultimate fulfillment.