<Tr> <Th_colspan="2"> Word dividers </Th> </Tr> <Tr> <Td> interpunct </Td> <Td> </Td> </Tr> <Tr> <Td> space </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Th_colspan="2"> General typography </Th> </Tr> <Tr> <Td> ampersand </Td> <Td> & </Td> </Tr> <Tr> <Td> asterisk </Td> <Td> * </Td> </Tr> <Tr> <Td> at sign </Td> <Td> @ </Td> </Tr> <Tr> <Td> backslash </Td> <Td> \ </Td> </Tr> <Tr> <Td> bullet </Td> <Td> </Td> </Tr> <Tr> <Td> caret </Td> <Td> </Td> </Tr> <Tr> <Td> dagger </Td> <Td> † ‡ </Td> </Tr> <Tr> <Td> degree </Td> <Td> ° </Td> </Tr> <Tr> <Td> ditto mark </Td> <Td>" </Td> </Tr> <Tr> <Td> inverted exclamation mark </Td> <Td> ¡ </Td> </Tr> <Tr> <Td> inverted question mark </Td> <Td> ¿ </Td> </Tr> <Tr> <Td> komejirushi, kome, reference mark </Td> <Td> ※ </Td> </Tr> <Tr> <Td> number sign, pound, hash </Td> <Td> #</Td> </Tr> <Tr> <Td> numero sign </Td> <Td> No </Td> </Tr> <Tr> <Td> obelus </Td> <Td> ÷ </Td> </Tr> <Tr> <Td> multiplication sign </Td> <Td> × </Td> </Tr> <Tr> <Td> ordinal indicator </Td> <Td> o a </Td> </Tr> <Tr> <Td> percent, per mil </Td> <Td>% ‰ </Td> </Tr> <Tr> <Td> plus and minus </Td> <Td> + − </Td> </Tr> <Tr> <Td> equals sign </Td> <Td> = </Td> </Tr> <Tr> <Td> basis point </Td> <Td> ‱ </Td> </Tr> <Tr> <Td> pilcrow </Td> <Td> ¶ </Td> </Tr> <Tr> <Td> prime </Td> <Td> ′" ′′′ </Td> </Tr> <Tr> <Td> section sign </Td> <Td> § </Td> </Tr> <Tr> <Td> tilde </Td> <Td> ~ </Td> </Tr> <Tr> <Td> underscore, understrike </Td> <Td> _ </Td> </Tr> <Tr> <Td> vertical bar, pipe, broken bar </Td> <Td> ‖ ¦ </Td> </Tr> </Table> </Td> </Tr>

When were plus and minus signs first used