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Thanks! I'm going to go with subscription ratio - I couldn't find it in my Zahn, but then I was late and it was tired.... Yes, these are derivatives - warrants cum index certificates - RISKEEEE! 4 KudoZ points were awarded for this answer
Explanation: This is the nearest I can come in terms of a concise term. You're evidently talking about options or derivative securities.
Option: A contract that entitles the holder to buy or sell a number of shares (usually 100) of a particular common stock at a predetermined price (see striking price) on or before a fixed date (see Expiration Date).
So basically, for a call-option, the "Bezugsverhältnis" is the relationship between the option and the quantity of the underlying security that each option allows the holder to purchase upon exercising the option (the expiration date for European options).