The Sign of Jonah
The 'Sign of Jonah' refers to Jonah's three days in the belly of the great fish, prefiguring Jesus' death, burial, and resurrection after three days.
This symbol underscores the theme of repentance and redemption. Just as Jonah's preaching led to Nineveh's repentance, Jesus' resurrection calls for repentance and faith.
Jonah was a well-known prophet whose story of deliverance and repentance was familiar to Jewish audiences, making it a powerful symbol for Jesus' audience.