I'm guessing you mean vertical and horizontal markets, it's quite a commonly used term. Sometimes referred to as their respective spaces.
Lifting directly from wikipedia:
Vertical market
A vertical market (often referred to simply as a "vertical") is a group of similar businesses and customers that engage in trade based on specific and specialized needs. Often, participants in a vertical market are very limited to a subset of a larger industry (a niche market). An example of this sort of market is the market for point-of-sale terminals, which are often designed specifically for similar customers and are not available for purchase to the general public. Vertical marketing can be witnessed at trade shows. The opposite of vertical marketing is horizontal marketing.
A horizontal market is a market which meets a given need of a wide variety of industries, rather than a specific one.
Example
In technology, horizontal markets consist of customers that share a common need that exists in many or all (vertical) industries. For example, customers that need to purchase computer security services or software exist in such varied industries as finance, healthcare, government, etc. Together, these customers constitute the security horizontal market. Other examples of horizontal markets include computer storage, accounting, desktop graphics, computer-aided design, sales force automation, and human resources. Often specialized distribution channels emerge to serve these unique horizontal markets.