That doesn’t make sense to me. Even disregarding cases where people mix languages (how do you write a dictionary? If the answer is “just create a data structure combining multiple strings”, shouldn’t we standardize how to do that?), all languages share thousands of symbols such as currency symbols, mathematical symbols, Greek and Hebrew alphabets (to be used in math books written in the language), etc. So, even languages such as Greek and English share way more symbols than that they have unique ones.