
Dollar sign after the number, and other signs of functional illiteracy
If you regularly read and see words written (professionally written as in books and periodicals, not on Reddit) then some things just become common sense to you: You're not likely to mix up homophones (they're/there/their), you're not likely to misuse apostrophes to pluralize something, and you're not likely to write the "$" Dollar sign after the numerical value (Edit: In USD, you chucklefucks. Thanks for proving my point)
inb4 some places actually do use currency symbol after the number as the convention - thank you, I know, but nearly the entire world does not, you're just making excuses.
inb4 but it should be that since that's how you say it, e.g. "three dollars" - that's dumb