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HP generally identify a product with a name, such as:

• HP Officejet Pro 8500A Plus e-All-in-One
• HP Color LaserJet CM3530 Multifunction Printer

As well as the name every HP product has a part number. For instance:

• HP Officejet Pro 8500A Plus e-All-in-One

Model numbers are:
CB022A  - HP OFFICEJET PRO 8500 ALL-IN-ONE PRINTER A909A
CB023A  - HP OFFICEJET PRO 8500 WIRELESS ALL-IN-ONE A909G
CB025A  - HP OFFICEJET PRO 8500 PREMIER ALL-IN-ONE

• HP Color LaserJet CM3530 Multifunction Printer

CC519AR  - HP COLOR LASERJET CM3530 MULTIFUNCTION PRINTER - 
CC520AR  - HP COLOR LASERJET CM3530FS MULTIFUNCTION PRINTER - 

The numbers are much shorter than the names and remove most of the ambiguity about whatever is being described.   At one time HP tended to use only the numbers (as did IBM). For instance the first laser printer was the HP 2680A with the informal name "EPOC" and the second the 2687A had the informal name "Bonsai".   People don't usually find numbers terribly memorable and for the first inkjet printer HP's marketing people came up with the catchy name ThinkJet. By extension the third laser printer got the name LaserJet which is now the sub-brand for laser printers.

HP identify five parts in their names

What HP call Model Numbers are usually a mixture of letters and numbers. Older printers have numeric names like LaserJet 4 or LaserJet 2400 . If the printer was sold with any components that would normally be optional then letters were added to the end on the name, so a Color LaserJet 4600dtn was shipped with the Duplex, extra Tray and Network options. The Color LaserJet 2600n always shipped with the network port, it's embedded on the formatter.

Letters formerly used are:

There are a few light versions of printers. More usually HP have made a distinction by using a different model number. For instance the 1500L had a single tray whilst the 1500 had multipurpose and cassette trays. However HP then make a similar distinction using 2820 for the basic printer whilst the model 2830 and 2840 have extra features.

HP then decided to use initial letter on laser printer product names to say whether its a colour or multifunction machine

HP also re-thought their suffix letters, notably replacing dtn with x .