critical point
the smallest ordinal which is not mapped to itself by an elementary embedding of a transitive class into another
en-US/ˈkɹɪtɪkəl ˈpɔɪnt/
en-GB/ˈkɹɪtɪkəl ˈpɔɪnt/
the smallest ordinal which is not mapped to itself by an elementary embedding of a transitive class into another