What does the "eye" symbol mean at the bottom of Telegram messages? In Telegram Messenger, at the bottom of each message, there are two numbers. One is the time that the message has been sent, and the other is a number near an eye symbol. Does anyone know what this number means?

Note that this number is in all messages, not only messages released in groups or channels.
These are two screenshots:
As per Telegram's official blog:

Each post in a channel has its own view counter. 
 
Views from forwarded copies of your messages will be included in the total count.

That eye icon is usually used to depict the total page or post views. For example, Quora uses a similar icon:

You can find some more icons here.