Several symbols similar to what we can find in FontAwesome or FontSymbols can be used in Maniaplanet labels. It's recommended to use them instead of images since it means better performances for your manalinks/scripts.
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★☆☐☑☒☛☞✓✗〃⎘☍⎀✂⏰⏱⏲⏳⏴⏵⏶⏷⏸⏹⏺🔁☺⌨✎✍✉←↑→↓↔↕⇄⇅↲↳↰↱↱⇤⇥
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🌐🎥💾🎮🏃🏆🏆🏁💢💿📷🔍🔧🔨🔀🔀🔂🔂🔑📎👤👥🔔🔕
If you can't view some of the symbols on your web browser, just open this link in the Maniaplanet browser ingame: http://files.maniaplanet.com/xbxtest/SymbolTable.xml.