Question about playbook diagrams

Question
Dear John,

   Please look at the entry for "F" and the entry for "H" in the following football terminology dictionary:

http://www.johntreed.com/fbdictionary.html#H

   The entry for "F" says that "F" stands for fullback.  The entry for "H" says that "H" stands for fullback in a two-back offense.  However, in a NFL playbook, wouldn't H stands for halfback?  For example, please see this playbook:

https://fastandfuriousfootball.com/prooffense/2005%20carolina%20Panthers.pdf

   The link shows a playbook, and it seems like "H" lines up where the halfback should go.  Also, it seems odd that both H and F stand for fullbacks, as that would mean two fullbacks would often be in a formation without there being a halfback at all.  So what does "H" really stand for in the playbook I linked you to?

Mike  

Answer
    Mike often times the (H)back is often considered a hybrid type position.  Part tight end part fullback sometimes a slot receiver, motion trap man and even sometimes a running back.  The H back is most often referred to in this capacity.  Especially in a pro style playbook.