How to find the NLS_LANG to set for a database?

One can use the following v$nls_parameters view to find the database LANGUAGE, TERRITORY and CHARACTER SET.

select DECODE(parameter, 'NLS_CHARACTERSET', 'CHARACTER SET',
'NLS_LANGUAGE', 'LANGUAGE',
'NLS_TERRITORY', 'TERRITORY') name,
value from v$nls_parameters
WHERE parameter IN ( 'NLS_CHARACTERSET', 'NLS_LANGUAGE', 'NLS_TERRITORY')
/

NAME VALUE
————- —————–
LANGUAGE AMERICAN
TERRITORY AMERICA
CHARACTER SET WE8ISO8859P1

export NLS_LANG=<language>_<territory>.<character set>