1. A tactile code for use by visually impaired and blind persons comprising embossed alphabet symbols representing the letter of the conventional Roman alphabet and embossed numeral symbols representing the conventional Arabic numerals; all of said alphabet and said numeral symbols comprising at least a frame, and at least of some said alphabet symbols and said numerals symbols also comprising an interior portion surrounded by said frame; said alphabet symbols being divided into first, second, third, and fourth regions, said alphabet symbols in said first and third regions having a circular frame and said alphabet symbols in said second and fourth regions having a square frame, and each of said alphabet symbols embodying at least a physical association with its corresponding capital letter of the Roman alphabet; and said numeral symbols all having a diamond frame and each of said numeral symbols embodying at least a logical or physical association with its corresponding Arabic numeral.