My first thought was that these insignia, similar to the insignia on the period Scheinwerfer sleeve patch, were taken from what the Austrians called the "Konventionelle Zeichen", that is, the conventional unit map symbols.These were the small shorthand version of indicating a unit on a map or on a unit order of battle or strength chart. I looked through eleven pages of the Austrian symbols and could not come up with it, but a similar German chart may include this.
Chip