CCXL
CCXL is the Roman numeral for 240. It is formed by CC (200) followed by XL (40). The XL portion uses subtractive notation, since X placed before L indicates 10 subtracted from 50, yielding 40, and the two Cs add to 200 for a total of 240.
Historically, CCXL may appear in dating and numbering. It can denote the year 240 CE (AD 240)
In modern usage, CCXL can also serve as an alphanumeric designation in product names, model numbers, or