gui design - What do you call embedded dotts/lines which indicate sliding in GUI?

I have attached an image which explains which element I am talking about. I am trying to find out it's proper name.

Can anyone help me please?

Answer

"Handle". However, it's usually prefixed by its intended use: "drag handle", "resize handle", "scroll handle", etc.

(From left to right: scroll handle, rotate handle, resize handle, sort handle.)