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What in User interface optimal category icons

Question
balloon, bubble, chat, question, speech, talk, what
help, info, information, what
bubble, chat, speech, talk, words, question, what
bubble, chat, speech, talk, words, question, what
?, ask, faq, question, questionmark, what, when, where, why
balloon, bubble, chat, question, speech, talk, what
disappoint, disappointed, warn, warning, what
android, error, question, watch, wear, what
help, interface, question, ui, user, web, what
ask, information, misc, question, question mark, reference, what
help, info, tutorial, what, about, data, information, question, service