If the meeting organizer enables the Non-verbal feedback and Meeting reactions features, meeting participants can place an icon in their video panel and beside their name in the participants panel to communicate with the host and other participants without disrupting the flow of the meeting. For example, selecting Slower places the slower icon in your video panel and beside your name to indicate you would like the host or presenter to go slower. 

All participants can see the icons that everyone else has chosen. In addition, the host sees a summary of how many participants are displaying each icon, and has the option to remove all feedback.

By default, the meeting reactions have a yellow skin tone. On the Zoom desktop client for Windows and macOS, you can also set your skin tone. 

Emoji reactions will disappear after 10 seconds, while raise hand and non-verbal feedback, such as Yes, No, Slower, and Faster, will be persistent and must be manually removed by the participant or host.