Unable to answer "What kind of memorial is this?" for https://osm.org/node/3086399370 via StreetComplete 54.0:

I can't find a memorial site.

Attached photo(s):
https://westnordost.de/p/176534.jpg
https://westnordost.de/p/176535.jpg
https://westnordost.de/p/176536.jpg