| array | an array of objects |
| association_list | retrieve, insert or delete an item |
| avl_table | |
| binary_table | the "type function" for binary |
| boolean_array | |
| c_function | |
| character | a unicode code point encoded as a 32-bit value |
| character_array | |
| date_and_time | the prototype object for date-and-time objects |
| device_id | a POSIX device ID |
| directory | a POSIX directory |
| dirent | a directory entry |
| error | the prototype object for all error objects |
| error_number | a POSIX error number |
| false | the *type* of the boolean value **false** |
| file_descriptor | a POSIX file descriptor |
| file_type | a POSIX file type |
| function | the prototype object for all functions |
| generic_array | the prototype object for all kind of arrays |
| generic_list | the prototype object for all kind of lists (including strings) |
| group_id | a POSIX group ID |
| hash_set | a set for fast random access |
| hash_table | a table for fast random access of items |
| inode_number | a POSIX inode number |
| insert_order_set | retrieve or add an item |
| insert_order_table | retrieve or add an item |
| int16_array | |
| int32_array | |
| int64_array | |
| int8_array | |
| integer | the prototype object for all integral numbers |
| io | the prototype for all input-output objects |
| io_task | |
| key_order_set | a set which items are stored in key-order |
| key_order_table | a table which items are stored in key-order |
| key_value_pair | the prototype object for all key-value-pair-objects |
| list | |
| negative_integer | |
| number | the prototype object for all kinds of numbers |
| object | the prototype object for all "normal" objects |
| octet_string | a string where all characters fit into an octet |
| passwd | a password entry |
| polymorphic_function_with_setter | the prototype object for all polymorphic functions with a setter |
| positive_integer | the prototype object for all non-negative integers |
| process_id | a POSIX process ID |
| quad_octet_string | |
| real | the prototype object for all non-integral numbers |
| screen | the prototype objects for all screens |
| set | the prototype object for all kinds of sets |
| shutdown_type | a POSIX shutdown type |
| stat | file status information |
| string | the prototype object for all strings |
| table | the prototype object for all tables |
| terminal | the prototype objects for all terminals |
| terminal_attributes | a structure that stores the terminal attributes |
| true | the *type* of the boolean value **true** |
| tuple | the prototype object for all tuples |
| uint16_array | |
| uint32_array | |
| uint64_array | |
| uint8_array | |
| undefined | the undefined object |
| unique_item | this is the prototype object for all unique items |
| user_id | a POSIX user id |
| value_range | the prototype object for all value-range-objects |