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.
How to read and how to write XXII. Symbols are written and read from left to right, from highest to lowest. If number XXII is within to text or sentence it should be read in its equivalent in arabic numbers, in this case 22. XXI is number 21. XXIII is number 23. Calculate the conversion of any number and its equivalent in roman numerals with our roman numerals converter.