I've seen a few sellers now have an abbreviation of their user name in the small, circular profile photo, on the listing page.
It can look a bit odd... if your user name happens to be Godfrey1955, or Poolside247, you will just see 'God' or 'Poo' in the circle, although some have just the initial letter in a coloured circle, like those on the new Messages page...
If you haven't got a profile photo, has eBay automatically applied this 'tweak' on your behalf?