N - Network. This generally means that the printer has an ethernet port to connect to a network.
W - Wireless. This indicates wireless connectivity for extra convenience. Printers with wireless function can print via smartphone or computers connected within a local network.
F- Fax. Although faxing is fast becoming an obsolete technology, many businesses still use it and some of the most popular HP printers have it. Take note that some multifunction printers may not have fax capabilities so make sure the printer model name has an F if you require faxing.
E - ePrint. Found in many HP printers, this indicates that the printer allows printing via email.
D - Duplex Printing. This means that the printer can print on both sides of a sheet of paper without the need to manually flip and insert the paper again.
BT - Bluetooth. Printing via Bluetooth was a popular feature in older printers but have largely been replaced by WiFi printing in newer models.
C - Color. This simply indicates that the printer can do both monochrome and color printing.
T - Extra Tray. This indicates that the printer has an extra paper tray. This is commonly found in enterprise-class printers.
MFP - Multi-function printer. This isn't a suffix but is usually found in many HP printers. It simply means that the printer can do other capabilities such as copying and scanning aside from printing. Older MFPs can also do faxing but newer printer models leave out this aging technology and have the MFP.
I - Imaging. This means that the printer has a memory card slot for photo printing.
X - This means that the printer is multi-feature, most commonly a combination of duplex printing, networking, and extra tray.
S or SK - Stapler or Stacker. This indicates that the printer can staple printed paper together, a function found in some large volume printers only.