Oracle A423961 - Manual (Page 178)

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F – 2 Oracle7 Server Getting Started for Windows NT
NLS_LANG
When you install Oracle7 Server for Windows NT, you select a language
for database messages. The Oracle Installer supplies a value for the
NLS_LANG parameter to specify the language selected.
The NLS_LANG parameter uses the following format:
NLS_LANG = LANGUAGE_TERRITORY.CHARACTER_SET
where language specifies the language and its conventions for displaying
messages and day and month names, territory specifies the territory and
its conventions for calculating week and day numbers, and character_set
controls the character set used for displaying messages.
The default language at installation is American English. If you accept
the default language, the following value is supplied for the
NLS_LANG parameter:
AMERICAN_AMERICA.WE8ISO8859P1
Attention: To reset the NLS_LANG parameter to different
values for language, territory, or character set, you must install
the complete set of language files for that component in the
\ORANT\RDBMSnn directory. Refer to the section Installing
Additional Languages later in this appendix for installation
information.
Territory and Character Set Defaults
The following table lists the default territories and character sets for
each of the languages supported by Oracle7 Server for Windows NT.