Option symbol RZBPR, what does "SDO" stand for?

This OEX option expires today, as such i believe it's a weekly option. But my trading system shows "SDO" as an identifier. What is SDO?
 
I believe that stands for Short Dated Option.

AZD

Quote from wilburbear:

This OEX option expires today, as such i believe it's a weekly option. But my trading system shows "SDO" as an identifier. What is SDO?
 
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