V$NLS_VALID_VALUES

V$NLS_VALID_VALUES lists all valid values for NLS parameters.

Column	Datatype	Description
`PARAMETER`	`VARCHAR2(64)`	Parameter name (`LANGUAGE` \| `SORT` \| `TERRITORY` \| `CHARACTERSET`)
`VALUE`	`VARCHAR2(64)`	NLS parameter value
`ISDEPRECATED`	`VARCHAR2(5)`	Indicates whether the parameter has been deprecated (`TRUE`) or not (`FALSE`)