Litz Wire
Generally understood to apply to conductors built-up by successive stranding of wires in groups of three, each individual wire being insulated with enamel or silk. The wire is constructed of individual film-insulated wires bunched or braided together in a uniform pattern of twists and length of lay. Used for products such as high frequency transformers and kitchen products, it is designed to prevent heat generation and decrease AC resistance. The name is derived from the German word litzendraht, meaning woven wire.