What are the different message delivery status icons on the Signal Messaging app

 

What are the different message delivery status icons on the Signal Messaging app

 

A dotted circle indicates that the message is in the process of being sent to the recipient, a single tick with no highlight indicates that the message has been sent, and is currently on its way to your recipient’s inbox. When the single tick turns to a double tick with no shading, this means that the recipient has received the message and it is not in their inbox.