A bone spur (osteophyte) is a bony growth formed on normal bone. Most people think of something sharp when they think of a spur, but a bone spur is just extra bone. It's usually smooth, but it can cause wear and tear or pain if it presses or rubs on other bones or soft tissues such as ligaments, tendons, or nerves in the body.
An immediate or cancel order (IOC) is an order to buy or sell a security that must be executed immediately, and any portion of the order that cannot be immediately filled is cancelled.
In the finance world, a cancellation is a notice informing a broker that a trade was made incorrectly. In the insurance world, a cancellation occurs when a policyholder stops paying the premium on an insurance policy and/or the insurance policy is no longer effective.