Disk

A disc or disk generally refers to a round flat object, although the usage varies between different variants of English. Common types of disc include:

The Simple English Wiktionary has a definition for: disc and disk.

• Flying disc or, more specifically, a Frisbee, a disk-shaped toy
• Intervertebral disc, between the bones in the spines of vertebrates
• Parking disc, or parking disc machine
• Tax disc, a vehicle licence