In these icons, some have two >'s, others one or none. What are the meanings behind these icons (highlighted in yellow)?I know that clicking on them marks the conversation as important, but what do the >'s mean?
What do these icons in Gmail indicate?
gmail
They are called Personal level indicators and show you at a glance whether you were the only recipient (  ) or there were more than one (  ). They can be turned on/off from the settings page.