barred text in messages

Hello,I wonder when i write a message to someone and then i watch what i sent, sometimes a part of the text written is barred, with a line on the text. What does it mean? I asked to someone and said me that he can see the text -but barred- that I send.

Thanks for answers :-)Jp

-Minus signs do that.  I put a minus sign at the beginning and end of this post.-

- Nice, thanks for the trick ;) -

-:)-