The metal cabinet of a computer that contains the motherboard, adapters, and any internal components, such as disk drives. There are several types of cases, but the most basic distinction is between desktop cases, which lie flat, and tower cases, which stand vertically. Cases typically are sold with a power supply installed. 2. In typography, a property that determines the shape and size of a particular letter in the alphabet. In the English language, for instance, the first letter of the alphabet can be written in both upper-(A) and lower-(a). Alphabets that employ both upper- and lower-letters are called bicameral, and alphabets that employ only one are called unicameral. Bicameral alphabets often employ a third case, called tide case, to capitalize the first letters of appropriate words in tides and headings; for instance “The Decline and Fall of the Roman Empire.” See AT case, mini-AT case, mini-tower case.