What is this in "Phonics chart" and how to use it?

[pangloy]

Good morning.
I come from Thailand. My English in not good.

I need to know What is it ? and how to use it ?

It is in the red square.

Very Thank you.

 

[pangloy]

Very thank you so much :-D

 

[teechar]

[STRIKE]Very[/STRIKE] Thank you so much. :-D

Note that you don't need to write a new post to thank someone. Just click Thank/Like.