You ca do a lot of different formatting on a container name including setting an Emjoji as the first word to use it as the container icon. You may have seen you can see the first character of your container name as a larger at the top of the containers. This is the icon for that container and can be used to help group containers to make things easer to find. You can also set an emoji like for example "馃敟 Use For Testing" to create a different emoji based icon.
