Same here, but my particular one is using DPI for everything, even the big guys doing the teaching, but most know what they mean. Images in Photoshop and scanned images are expressed in Pixels per inch, PPI, halftones are expressed as Lines per inch, LPI, and Laserprinters, inkjet printers, and imagesetters use Dots per inch, DPI.
Steve
ps. we'll leave out Spots per inch...