Metal plates with engraved text are regularly used for marking switch boards, and fire doors. Classy engraved metal desk name plates are also popular. We highly recommend engraved signs where vandalism is an issue.
Do you provide a product that you leave on site? Then consider a small plate with your logo engraved into it. These plates can then be attached and left on your product at the site, helping to ensure that you receive any future business from your customer.