There are a dozen math symbols included: 0x2202 ∂ Flat, natural, sharp, and gradient didn’t make the cut. The rest of the characters in the intersection are Greek and Cyrillic letters and a few scattered symbols. This range includes the code blocks for Basic Latin, Latin-1 Supplement, Latin Extended-A, and some of Latin Extended-B. Most of the characters with code points up to U+01FF are included. There are 585 characters supported by all the fonts listed above. My thought was that this would make a very conservative set of characters. ![]() So what characters can you count on nearly everyone being able to see? To answer this question, I looked at the characters in the intersection of several common fonts: Verdana, Georgia, Times New Roman, Arial, Courier New, and Droid Sans. One person said he couldn’t see the gradient symbol, but the rest of the feedback was positive. I also asked followers whether they could see the math symbols ∂ (partial, U+2202), Δ (Delta, U+0394), and ∇ (gradient, U+2207). One person said none of the symbols show up on his Blackberry. However, several were unable to see the natural sign from an Android phone, whether using a browser or a Twitter app. Most people could see all three symbols, from desktop or phone, browser or Twitter app. I asked whether people could see ♭ (flat, U+266D), ♮ (natural, U+266E), and ♯ (sharp, U+266F). I’m starting a Twitter account and so I wanted to know whether I could count on followers seeing music symbols. ![]() When you use any slightly uncommon character, you have no guarantee someone else will be able to see it. ![]() Unicode is supported everywhere, but font support for Unicode characters is sparse.
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