WHITE CONCAVE-SIDED DIAMOND is one of the 48 characters in the Miscellaneous Mathematical Symbols-A Unicode subset.
The image below shows how the WHITE CONCAVE-SIDED DIAMOND symbol looks like in some of the most complete UTF-8 fonts: Code2000, Sun-ExtA, WenQuanYi Zen Hei and GNU Unifont. If the font in which this web site is displayed does not contain the WHITE CONCAVE-SIDED DIAMOND symbol, you can use the image below to get an idea of what it should look like.
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