I'm not familiar with "ipz661" as a specific term or product. It could be:

1. A model number or part of a product code

2. An abbreviation or acronym for something

3. A typo or misspelling of another word

Without more context, it's difficult to provide accurate information about what "ipz661" might refer to. Could you please provide more details about where you encountered this term or what field it might relate to? This would help me give you a more precise answer.