>>11288896It's actually 999.
Our universe has exactly 3 digits. But we can depict a conceptual fourth digit by using commas and write abstractions such as "1,000" to represent 999+1, which we can't visualize. We can even go into much higher digits and write things like "1,000,000" which is a 7-digit number that represents (9992+999x2)+1. Some mathematicians even believe that our universe actually has up to 10 or 11 digits.