This document describes how you can find a more appropriate model number that better represents your exact type of Notebook PC. You can use the model number (also called a product name) to download drivers, find helpful documents, or get on-line support.
Option 1: Use System Information or HP Support Assistant in Windows
In Windows, press the fn + esc keys on the notebook’s keyboard to open the HP System Information window.
A System Information window appears showing a product name and a product number. The product name shown might represent many types of models and might not be suitable for getting proper support for your computer. Instead, use the product number when working with HP Support. The product number contains a “# ” character and is another form of model number that best represents your computer’s configuration.
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Article Source: HP Support