Applies to: Microsoft Teams.
Amid a meeting, you can raise a virtual hand to tell people you wish to contribute without disrupting the flow of the conversation.
Simply press Raise your hand 
in the meeting controls.
Everyone in the meeting will notice that you’ve raised your hand.
Meeting presenters will even get a notification that your hand is raised, and they can put your hand down when you’ve had a chance to speak.
Click Show participants 
to view a list of everyone in attendance. Anyone who’s raised their hand will have an icon beside their name. Once numerous people raise their hands, they’ll be shown in the order by which they raised them.
Note: This feature isn’t available in one-on-one calls.