There are other ways to check.
Code:
SQL> desc nls_database_parameters
Name Null? Type
--------------------------------------- -------- -------------
PARAMETER NOT NULL VARCHAR2(30)
VALUE VARCHAR2(40)
How do I find which settings I currently have for NLS features?
NLS_DATABASE_PARAMETERS - defaults set up for the database at creation
NLS_SESSION_PARAMETERS - parameters set by NLS_LANG or alter session (does not include client character set)
NLS_INSTANCE_PARAMETERS - parameters set in init.ora
V$NLS_PARAMETERS - values of NLS parameters for current values
V$NLS_VALID_VALUES - values which can be used for CHARACTERSET, LANGUAGE, TERRITORY, SORT (dependent on what was loaded at install time)