I often ask students to give me thumbs up/down and ask several to share why.
Additionally, we have "take a stand " and “Discuss and Defend” days in my 10th grade ELA class. They wanted to be able to talk about relevant topics (for them) and its great prep for argumentation and persuasive writing.
They have an Emoji Day on Friday to reflect on that weeks topics. They like the emojis, but they also have to explain what they liked or didn’t like, why, and provide me with some additional topics they might like to discuss. IT’s not major, but they are getting used to providing feedback and are feeling more comfortable about being honest in their thoughts and ideas.
Emoji Friday