That pattern is used for 50A 120/240 appliances such ranges. Typically not wall ovens or cooktops, as they are hard wired. Dryers use a similar patter, but have an L shaped neutral.
FWIW, we've used the 14/50 and 14/30 for years in Canada, and TMK should be what was installed in mobile homes and condos/apartments in the USA, since they are supplied as sub-panels where ground and neutral must be separate.
