We've I've found an engraving on the Dining Room table, underneath the tablecloth: letters (A-Z) and numbers (0-9), along with the words "Yes", "No" and "Goodbye" at the top right, top left and bottom centre respectively. It's all carved right into the wood.
It apparently looks like someone has been practicing engraving in calligraphy there or perhaps it could be a tool for teaching a child to read, something like that.
It just seems strange that it's on such a grand and expensive-looking table so, we I wondered, has anyone heard of anything like this before?