Final answer:
Type S bugle head screw is used to attach gypsum panels to furring channels.
Step-by-step explanation:
When gypsum panels are attached to furring channels, a Type S bugle head screw is used. This screw has a bugle-shaped head that helps to sink it into the gypsum panel without damaging the surface. The Type S bugle head screw is commonly used in construction for attaching gypsum panels to furring channels.