I've never used the term 'ding' in the context of an ebay situation but I would imagine it means: (a) defects or late shipment marks for a seller and/or (b) unpaid item strikes for a buyer.
With regular posters on ebay Community, it's easy to fall into the jargon trap that is meaningless to the new users who come here seeking advice. In that respect, I fall back on my training as a journalist: the first time an unwieldy term is used, it is spelled out in full. The second time that term is used, it is spelled out in full again but with the acronym added in parenthesis immediately afterwards. And the third time the term is used, it may be used as the acronym without restraint.
Example: If you get a message from ebay stating the item you bought has been removed and discover the seller is now suddenly Not a Registered User, you may have cause for complaint. Check your Estimated Delivery Dates. If that Estimated Delivery Date (EDD) has passed and you still have nothing, it's time to immediately go to the Resolution Centre and open an Item Not Received case against the seller who is Not a Registered User (NARU). Be sure to cite that the seller is NARU when opening that Item Not Received (INR) case. Without proof of delivery within the EDD, the INR will close against the NARU in your favour as the buyer.
Clear as mud, correct? From a Canadian Press style point-of-view, it is.
