Point engraving, also called line engraving, involves marking the glass with a hand-held diamond or tungsten carbide point. Line engraving was at one time called 'scratch engraving', which exactly describes it. The point, held in the hand or on the end of a scriber, scratches the surface of the glass, making a contrasting white line which sparkles in the light. The effect is quite different from the mark made using a wheel or drill.
The example shown here was engraved by Annabel Rathbone FGE.