There are arguments for both terms. In general PPI is a bit more correct but DPI is more commonplace, hence its usage on this site (also ppi.lv wasn't available :P). If you are interested, you can read more on this in the Wikipedia article about Pixel Density. In more recent terminology, DPI is often used for the. Parts for HTC One M9, Apple iPhone 7 32GB T-Mobile Smartphones, HTC One M9 Unlocked Bar Cell Phones & Smartphones, LCD Screens for HTC One M9, Samsung Galaxy S7 edge 32GB Smartphones with T-Mobile, LG 32GB Boost Mobile Smartphones, iPhone 5 32GB T-Mobile, HTC 10 32GB Sprint Smartphones, HTC One M9 Verizon Cell Phones & Smartphones.