Definition: The term "040603" is a Roman numeral representing an integer in binary format, specifically for use in the 19th century. It is commonly used in historical context to denote multiples or divisions by 7, as it was originally represented using this form. The symbol used is "B", which stands for "binary". This numeral system uses only two digits (b and e), making it a bit simpler than decimal systems like the decimal system of base ten.