Nomenclature for all parts of a progressbar

I'm looking to get a name for all off the different parts of a progressbar.

e.g.

Loading [ =====>   ] 1/20 (5%) done

I want to know what name can be given to the following parts:

"Loading" label?

"[ ]" the body?

"===" progress line?

">" progress header

"1/20" Value

"(5%)" Percentage label?

"done" suffix/trailer?

Thank you