The term "Ejnar Dyggve" does not correspond to a widely recognized concept, theory, or established subject in publicly available encyclopedic sources. It may refer to a personal name, potentially of Scandinavian origin, as "Ejnar" is a Danish and Norwegian given name, and "Dyggve" appears to be a surname of Nordic origin.
Accurate information regarding this term as a concept, object, or significant entity is not confirmed. The term does not appear in major reference databases or academic sources as of the current knowledge base. It may pertain to an individual not widely documented in public or scholarly literature. Without further context, no definitive description can be provided.