I do not think there are any, but to proclaim you are a Catholic wear a crucifix with a corpus…this is very Catholic whereas non-Catholics tend not to.
Pectoral crosses worn by bishops, abbots and many religious orders don’t always have a corpus. The wooden cross without a corpus predates Protestantism by 300 years. No one knows exactly when it came into use, but the Franciscans wore it from 1209. Then there are very beautiful and ornamented crosses worn by the Eatern Catholics. The ones worn by by clergy usually have beautiful carvings and/or jewels.
Popes John Paul I, John Paul II, and Benedict XVI did not wear crucifixes. They have worn the simple cross. The simple cross has often served as a reminder that we must take up our cross and carry it.
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