Merchant Category Codes [pdf]

I found it interesting that there's a lot of super specific categories. E.g.:

* Commercial Footware [sic]

* Fireplace, Fireplace Screens and Accessories Stores

* Rubber Stamp Store

* Electric Razor Stores–Sales and Service

* Tent and Awning Shops

As well as the fact that every single airline, rental car, and hotel brand (e.g., Courtyard and Residence Inn separately, rather than one for all Marriott brands) gets its own MCC instead of there being one per industry like is the case for everything else.