[RolandF]

Hallo, Marc,
the combination <~+~ is strange indeed. For me it seems to have something to do with the IV.Gruppe and its staff. The double-wave of a late-war IV.Gruppe is quite different than the triple-wave of an early-war III.Gruppe.
The equivalent for the II.Gruppe could be <-+-, which is well known to us - but for the Geschwader staff.
But in case there´s a connection, other combinations with <|+| or <||+| would have quite a different meaning as a Stab marking for the III.Gruppe.
Just a thought. Could it be the late-war staff markings system was entirely changed after the introduction of a IV.Gruppe and the choice of 11,12,13 or 21,22,23 for the Staffel leaders?

Regards

Roland