Special characters in text represented as squares in some applications

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https://bbs.archlinux.org – Some webpages I go to seem to have blank square characters in the text where there should be a special character. Curious, I went ahead and opened a binary file in my text editor, KWrite. I expected to see special characters making up most of the garbage text, but instead I got blank squares in their place, along with ASCII characters.The special text characters I'm talking about are most of the time not even Unicode ones. These are characters that can be typed when, on Windows, you'd hold down ALT and punch in a four digit number, or if on Mac, hold down the ALT key and type a chara (HowTos)