Dial (Sunburst, Guilloché, Enamel, Sandwich, Tapisserie) refers to various decorative techniques used on watch faces, where Sunburst creates a radial pattern, Guilloché involves intricate engraving, Enamel uses colored glass powder fused to the surface, Sandwich features layered dials with cut-out numerals, and Tapisserie displays a textured grid pattern.