Icons and symbols are small visual elements that you can attach to topics in your mind maps, which add meaning and context to them. These miniature images can be used to depict priority, types of activities, tasks, and types of information and ideas.
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Chuck Frey discusses the role of icons and symbols in mind maps, gives tips how to use and how NOT to use them in your maps, shares websites for free icon download.
the importance of icons and symbols in "mind maps" or outlines, webs, anything like that. symbols can have a much broader meaning and definition, bringing ideas and memories up quicker than a vague word or phrase.