<Table> <Tr> <Th_colspan="2"> Katana (刀) </Th> </Tr> <Tr> <Td_colspan="2"> Katana signed by Masamune with an inscription (城 和泉 守 所持) in gold inlay, Kamakura period, 14th century, blade length: 70.6 cm </Td> </Tr> <Tr> <Th> Type </Th> <Td> Sword </Td> </Tr> <Tr> <Th> Place of origin </Th> <Td> Japan </Td> </Tr> <Tr> <Th_colspan="2"> Production history </Th> </Tr> <Tr> <Th> Produced </Th> <Td> Muromachi period (1392--1573) to present </Td> </Tr> <Tr> <Th_colspan="2"> Specifications </Th> </Tr> <Tr> <Th> Weight </Th> <Td> 1.1--1.3 kg </Td> </Tr> <Tr> <Th> Blade length </Th> <Td> approx. 60--73 cm (23 ⁄--28 ⁄ in) </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Blade type </Th> <Td> Curved, single - edged </Td> </Tr> <Tr> <Th> Hilt type </Th> <Td> Two - handed swept, with circular or squared guard </Td> </Tr> <Tr> <Th> Scabbard / sheath </Th> <Td> Lacquered wood </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Katana (刀) </Th> </Tr> <Tr> <Td_colspan="2"> Katana signed by Masamune with an inscription (城 和泉 守 所持) in gold inlay, Kamakura period, 14th century, blade length: 70.6 cm </Td> </Tr>

What is the blade of a katana called