 The RLM only assigned them for every design a separate number, which obviously served the same purposes as that used with aircraft, namely to provide a common basis for an exchange of drawings in the event of an intended production under license by other firms or by clubs, or even single persons and to secure the provision of spare parts.A rigid system of rules for the form and order of drawings was applied.Whereas RLM aircraft designations were prefixed by the number 8, glider references began with "108-", for example 108-53 referred to the DFS Habicht.