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…and include: clap, thumbs up, heart, laughter, wow!/surprise, and celebration. You can "assign" each of these icons a meaning in your class or let your students choose, but the key is to ask students to use them when they are moved to do so. For example, if they "love" the point you are making, they can post a "heart" icon. If they just figured something …
https://www.wichita.edu/services/mrc/OIR/TT/2020/Oct20TT.php