Specialty (noun)

1. A special area of expertise or interest.
2. A product or service that is particularly good or popular.
3. An item that is made or done in a particular way and is considered to be of high quality.

Origin:

The word specialty is from middle english specialte, from old french specialité, from special.

Examples:

1. His specialty was in neurosurgery.
2. The restaurant's specialty was seafood.
3. The store's specialty was handmade pottery.
4. She had a specialty in tax law.
5. The company's specialty was custom-made furniture.