ICT is an umbrella term that includes any communication device or application, encompassing: radio, television, cellular phones, computer and network hardware and software, satellite systems and so on, as well as the various services and applications associated with them, such as videoconferencing and distance learning.
Billboard is a common word for poster panels and bulletins. There are three standard kinds of billboards: Bulletins Standard sizes: 14 by 48 feet (672 sq. ft.), plus extensions 10'6 by 36 feet (378 sq. ft.), plus extensions. Bulletins are used to display painted or computer-generated vinyl images and are found in high density traffic areas, such as highways and Interstates.
A billboard (also called a hoarding in the UK and many other parts of the world) is a large outdoor advertising structure (a billing board), typically found in high-traffic areas such as alongside busy roads. Billboards present large advertisements to passing pedestrians and drivers.