The term "CARTRIDGE LOCK 12A" typically refers to a specific type of toner cartridge used in laser printers, specifically in the HP LaserJet 12A toner cartridges. The "12A" is a model number for a toner cartridge designed for use with various HP printers.

Here are some key details about the HP 12A toner cartridge:

• Model Number: Q2612A
• Type: Black toner cartridge
• Compatible Printers: It is typically used with HP LaserJet 1000, 1200, 1300, and 3300 series printers, among others.
• Function: It contains black toner powder and is used for printing black and white documents.
• Page Yield: The HP 12A toner typically yields around 2,000 pages, depending on the printer settings and the type of documents printed.