PCO stands for Potential Change Order (construction management). Suggest new definition. This definition appears somewhat frequently and is found in the following Acronym Finder categories: 1  Business, finance, etc.
Quick Answer. The Roman numeral XIX is the number 19. X is the number 10, and I is the number one. When a lower number is placed in front of a larger number, it indicates subtraction; IX is the same as 10 minus one, which equals nine. The Ancient Romans used different letters to represent numbers.
Roman numerals DXCIX. The roman numeral DXCIX corresponds to the arabic number 599. DXCIX = 599. We hope you have found this information useful. Please, consider to like this site on Facebook. Symbols are written and read from left to right, from highest to lowest. If number DXCIX is within to text or sentence it should be read in its equivalent in arabic numbers, in this case 599.