Detail
Type D. - Ridderade is a Dorf (Village).
Kr Syke - The Kreis for Ridderade is Syke. A Kreis is a government district (similar to a U.S. county).
See Heiligenloh 1) - A See notation means the entry is dependent on another entry. In this case, Ridderade is dependent on Heiligenloh 1), which should be consulted for additional information.