To access the catalog press CATALOG (located above the 0 key). The catalog contains an alphabetized listing of symbols and commands available on the TI-83. Some items in the catalog, such as the absolute value, cannot be found in any other location.

The highlighted A in the upper right corner of the screen indicates that the catalog is in alpha mode. Hence, you can conveniently jump to any part of the alphabetized index simply by pressing a letter (do not press the alpha key first). For example, to jump to the t-listings, press T (located above the 4 key).