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