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Any value in LUX belongs to a specific data class. Within a data class, several data types may be distinguished between. All data classes (and the data types within them) that are available to the user are described below.
| • Undefined: | Variables without a value | |
| • Scalars: | A single number | |
| • Strings: | A string of text | |
| • Arrays: | A group of similar values | |
| • File Arrays: | Assigning an array structure to a disk file | |
| • Associated Variables: | Assigning a record structure to a disk file | |
| • Ranges: | A range | |
| • Compact Lists: | A group of dissimilar values | |
| • Compact Pointer Lists: | A group of pointers to variables | |
| • Lists: | A group of dissimilar values | |
| • Structures: | ||
| • Pointers: | A pointer to another variable |