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Almost always it is legally fine. There is one major exception: Nazi symbology is banned in quite a few countries. And there are isolated examples of other symbols banned in individual countries, b...
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#4: Attribution notice removed
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/42680 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Almost always it is _legally_ fine. There is one major exception: Nazi symbology is banned in quite a few countries. And there are isolated examples of other symbols banned in individual countries, but those aren't commonly used or well known symbols (generally result of local strife, so symbols of local terrorist groups, etc.).