You Know thaïs inscription?

I have a money and there is an inscription ‘gros venor’.
what’s signification?

From a quick Google search, it looks like the name Grosvenor" could be spelled Gros-Venor or Gros Venor. None of these is in Brunk's index, but new names are regularly attested.

It is likely that this was a local business somewhere in Great Britain which could readily be identified as long as the coin circulated locally. Unfortunately, with just a name, it is most unlikely we will ever know who this was.