Naming Rules :
Table names and column names:
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Must begin with a letter
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Must be 1–30 characters long
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Must contain only A–Z, a–z, 0–9, _, $, and #
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Must not duplicate the name of another object owned by the same user
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Must not be an Oracle server reserved word
Naming Guidelines
Use descriptive names for tables and other database objects.
Note: Names are case insensitive. For example, EMPLOYEES is treated as the same name as eMPloyees or eMpLOYEES.
For more information, see Oracle9i SQL Reference,“Object Names and Qualifiers.”