ALisp has several core data types.
|Integers||Represented as a literal number.|
|Numbers||Represented as a literal number.|
|Symbols||Represented as any string of characters other than the following: single-quote, double-quote, left parenthesis, or right parenthesis. Additionally, symbols must not begin with a pound sign.|
|Pairs||Represented as a parenthesis-enclosed pair of two items, separated by a dot `.'. The first item is called the car and the second item is called the cdr.|
|Lists||Represented as a parenthesis-enclosed list of whitespace-separated objects. An improper list can be represented the same way as a list, except that it has a dot between its last two items.|
|Strings||Represented as a double-quote-enclosed string of any characters except for a double-quote.|
|Vectors||Represented as a proper list preceded immediately by a pound sign.|
|Special objects||These include the boolean true and false values (`#t' and `#f', respectively), and the end-of-list value (`()').|
Some other data types are used only internally by the ALisp interpreter.
Additional data types are defined by the FrontierSpace engine. These are: