In the Atlas relay/bridge details page, there are "tooltips" that show a description when you hover over each item.
When using Tor Browser at its default window size, the tooltips for the items in the left-hand column appear partially off-screen, so that the text is cut off. These include "Nickname", "OR Addresses", "Contact", "Dir Address", "Advertised Bandwidth", "IPv4 Exit Policy Summary", "IPv6 Exit Policy Summary", and "Exit Policy".