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)
CON_ID	NUMBER	The ID of the container to which the data pertains. Possible values include: 0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs. 1: This value is used for rows containing data that pertain to only the root n: Where n is the applicable container ID for the rows containing data