CONTROL KNOBS is one of the 768 characters in the Miscellaneous Symbols And Pictographs Unicode subset.
The image below shows how the CONTROL KNOBS 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 CONTROL KNOBS symbol, you can use the image below to get an idea of what it should look like.
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