Unable to answer "What kind of memorial is this?" for https://osm.org/node/1144493292 via StreetComplete 47.2:

Scheint es nicht (mehr?) zu geben.

Attached photo(s):
https://westnordost.de/p/118171.jpg
https://westnordost.de/p/118172.jpg
https://westnordost.de/p/118173.jpg