The 2 represents the Kompanie.
The Panzerabwehr was the anti-tank unit so would be Panzerabwehr Abteilung, with Abteilung roughly translating as a detachment/battalion.
The 33 refers to its organisational number so it would be Panzerabwehr Abteilung 33 of 33 Infanterie Division.
It was upgraded to a Panzerjäger Abteilung and transferred to 15 Panzer Division in 1941...
http://www.lexikon-der-wehrmacht.de/...ionen/15PD.htm