“Seat pitch” is the distance between seat back to seat back. It’s not the same as legroom, exactly — you aren’t always getting the same legroom with the same seat pitch because some airlines use thicker and thinner seats — but it’s the most generally accepted proxy for legroom.
It’s shocking to me that both Lufthansa and British Airways offer the same legroom in economy and business class for their intra-Europe flights. And that’s 30 inches, which is tighter than what the US majors offer in coach. British Airways “Club Europe” is coach with a blocked middle seat and a cold meal tray.