Some of the earliest Christian art that we know about was found in the catacombs of Rome. What was a symbol that artist used in early artwork in the catacombs that had a religious significance and anger across an infinity symbol or a cat
One significant symbol used in early Christian artwork found in the catacombs of Rome is the Chi-Rho symbol. The Chi-Rho is formed by overlapping the first two letters of the Greek word for Christ (ΧΡΙΣΤΟΣ), which spell out "chi" (Χ) and "rho" (Ρ). This symbol holds religious significance as it represents the name of Jesus and is often associated with his crucifixion and resurrection.
Another important symbol seen in early Christian art is the fish. The fish symbol (ichthys) is derived from the Greek word for fish (ἰχθύς) and forms an acrostic for the phrase, "Ἰησοῦς Χριστός, Θεοῦ Υἱός, Σωτήρ" (Iēsous Christos, Theou Yios, Sōtēr) which translates to "Jesus Christ, Son of God, Savior." It is a symbol of the faith and identity of early Christians.
While the infinity symbol (a sideways figure-eight) and cats do not hold specific religious significance in early Christian artwork, they may have been depicted in later medieval or Renaissance Christian art for different symbolic purposes.