Sorry, I don’t recognise this as a ‘standard’ workhouse abbreviation. Without an image to look at, it’s really hard to make suggestions.
Does it appear only for those who died in the workhouse, or for others too? Adults, children, male/female?
Possibly an abbreviation for a local place or a local institution that was so well-known it didn’t need to be spelt out? Or the initials of someone checking the record at a later date?
Others who know Sussex poor-law records better than I do may have suggestions. If not, you could try emailing the archivists at The Keep, who will probably have seen it before?
