 In his 1436 atlas, Venetian captain and cartographer Andrea Bianco introduced a table of numbers which he called the "toleta de marteloio" ("table of marteloio"), and the method of using it as the "raxon de marteloio" ("reason of marteloio").The meaning of "marteloio" itself is uncertain.The most widely accepted hypothesis, first forwarded by A.E.