A manual alphabet is used for fingerspelling names, which is based on the one-handed systems used in Europe and America for representing the Roman alphabet. In a two-way conversation, any manual alphabet known may be used; often one speaker will fingerspell using the alphabet of the other party, as it is often easier to spell quickly in an unfamiliar alphabet than to read quickly. ISL also has a standardised system of numbers as these signs vary greatly between sign languages.[citation needed]