What is a Turn-Flip?

[i]What is a "Turn-Flip" or "Flip-Turn"? What can they be?[/i][br][br]Play with the applet to see whether we need to add the composition of rotation and reflection to our list of four isometries.[br][br]Use the decomposition to describe precisely what the resulting isometry is.[br][br]What will happen if the rotation center falls on the reflection line?

Information: What is a Turn-Flip?