Do you mean "Ambigram" ; a typographical design or art form that may be read as one or more words not only in its form as presented, but also from another viewpoint, direction, or orientation.
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Paul was not crucified upside down, he was beheaded. Peter was the apostle that was, as he said he did not deserve the same death as Jesus.
A circle or a square.
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The next palindromic number after 1991 is 2002. A palindromic number reads the same forwards and backwards. In this case, 2002 reads the same whether you read it left to right or right to left.