Glossary Asset: A number of content files, along with metadata covering that content. Azimuth angle (of a satellite): The bearing angle, counted clockwise from the direction to the north, toward a satellite. Block: Often refers to a set of files that is defined by a playlist. Channel: Just as in television, the content sent to the screen. In a store or other location with digital signage, there might be several screens with different channels or messages (message channels).