Square symbols in a text message usually mean the sender has made a mistake. Many mobile phones cannot read foreign characters or alt symbols, and the instance of squares is most likely that.
Chat with our AI personalities
It was probably someone with an iPhone and used the little characters/icons in the text. Only people who have iPhones can see them or they will just look like squares if sent to non iPhone users. :)
Disconnected phone, at request of subscriber.
If you see a little box with symbols inside in a message or reply, it means the person used what is called an emoji program. It also can mean that you do not have the correct font installed on your system.
Message received
The meaning of a particular message depends with the message of the sender to the receiver.