The Greek noun deigma means a specimen, example, or display — something set out to be seen as a demonstration. It appears in Jude 7, where Sodom and Gomorrah are said to serve as a deigma — an example — undergoing the punishment of eternal fire.
Jude 7 uses deigma with profound solemnity: Sodom and Gomorrah 'serve as an example by undergoing a punishment of eternal fire.' Their destruction is not merely historical — it is a visible, ongoing lesson (deigma) about the certainty of divine judgment on sexual immorality and the rejection of God's order. The related verb deigmatizo (Colossians 2:15) describes Christ putting the defeated powers on public display at the cross — the ultimate reversal where the cross, itself a Roman display of shame, becomes the divine display of Christ's victory.