<P> Former Black Sabbath drummer Bill Ward suggested that the use of an inverted cross on the inner gatefold sleeve of their debut album by their label Vertigo may have been a promotional ploy or a misunderstanding of the nature of the group . </P> <Table> <Tr> <Td> Part of a series on </Td> </Tr> <Tr> <Th> Saint Peter </Th> </Tr> <Tr> <Td> </Td> </Tr> <Tr> <Th> In the New Testament </Th> </Tr> <Tr> <Td> <Ul> <Li> Walking on water </Li> <Li> Confession </Li> <Li> Servant's ear </Li> <Li> Denial </Li> <Li> Restoration </Li> <Li> Vision of a sheet </Li> <Li> Liberation </Li> <Li> Incident at Antioch </Li> <Li> Epistles <Ul> <Li> 1 Peter </Li> <Li> 2 Peter </Li> </Ul> </Li> </Ul> </Td> </Tr> <Tr> <Th> Other </Th> </Tr> <Tr> <Td> <Ul> <Li> Cross </Li> <Li> Sword </Li> <Li> Tomb </Li> <Li> Quo vadis? </Li> <Li> Primacy </Li> <Li> In Judaism </Li> <Li> In Islam </Li> </Ul> </Td> </Tr> <Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> </Table> <Tr> <Td> Part of a series on </Td> </Tr> <Tr> <Th> Saint Peter </Th> </Tr>

What does the upside down cross mean in ofwgkta