# TI-BASIC *[The language varies based on which calculator it is used on, but these will use the TI-84 unless otherwise noted.]* ### Factoid Variables can only store certain datatypes. For example, `A` – `Z` (and <code>θ</code>) store numerical values, `str0` – `str9` store strings, and `[A]` – `[J]` store matrices (2×2 arrays).