The American English word lox is derived from the Yiddish word for salmon, Laks (cf. German "Lachs"), which may ultimately derive from the Indo-European word for salmon, *laks-. The word lox has cognates in numerous European languages that also derive from one of the Indo-European languages.
Nova or Nova Scotia salmon, sometimes called Nova lox, is cured with a milder brine and then cold-smoked. The name dates from a time when much of the salmon in New York City came from Nova Scotia. Today, however, the name refers to the milder brining, as compared to regular lox (or belly lox), and the fish may come from other waters or even be raised on farms.
Scotch or Scottish-style salmon. A mixture of salt and sometimes sugars, spices, and other flavorings is applied directly to the meat of the fish; this is called "dry-brining" or "Scottish-style." The brine mixture is then rinsed off, and the fish is cold-smoked.
Gravad lax or gravlax. This is a traditional Nordic means of preparing salmon. The salmon is coated with a spice mixture, which often includes dill, sugars, salt, and spices like juniper berry. It is often served with a sweet mustard-dill sauce.
Other similar brined and smoked fish products are also popular in delis and fish stores, particularly in Chicago & the New York City boroughs, such as chubs, sable (smoked cod), smoked sturgeon, smoked whitefish, and kippered herring.