For a List what is the term for the spacing between the marker and the margin.? I've searched the Internet and found it a couple of years ago but forgot. Tried searaching again and couldn't find it.

A typical list (like the one below) has:

• a first line “indent”
• then there is the list element symbol, e.g. “•” or “—” and so on. 
• then there is usually a “tab” as control character.
• then comes the actual paragraph with its own indent

Are you looking for another term not already listed here?

A typical list (like the one below) has:

• a first line “indent”
• then there is the list element symbol, e.g. “•” or “—” and so on. 
• then there is usually a “tab” as control character.
• then comes the actual paragraph with its own indent

Are you looking for another term not already listed here?

It's the spacing between the list margin and the glyph marker.