If a desired icon isn't included in one of the existing icon-font packages, you can add it to the package's custom icon set with IcoMoon.io:
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Click the Import Icons button in the top-left corner.
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Pick
selection.json
from the package's base directory. -
You may be presented with a dialogue asking "Your icon selection was loaded. Would you like to load all the settings stored in your selection file?". If so, click Yes.
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Add your desired icon/s.
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Export and extract the contents of the downloaded zip file to your fork's
fonts-src
directory.