The latest feature added to Google Meet is a "Raise Hand" function. This function will show students a "raise hand" icon in the bottom row menu during Google Meet events. Students can click that to signal that they have something to say. You could also just use it to have students show agreement with a statement like, "raise your hand if you've heard Mr. Byrne tell this dad joke before." As the teacher or host of a Google Meet you have control to "lower hands" after they've been raised.
The new hand raising feature in Google Meet is available to some G Suite for Education users beginning today. Other users will see the feature appear in the next couple of weeks. This feature will be on by default for all users. You can read more about how it works right here on the Google Meet help forum.