What is the meaning of throat letters in Arabic?

Question
What is the meaning of throat letters in Arabic?

Answer
The throat letters, which in Arabic is , are the six letters pronounced from the throat.
You can view the lesson on their articulation point at the following link:
http://www.abouttajweed.com/articulation-points-areas-of-the-arabic-letters/the-articulation-points-of-the-t.html