1 Echocardiography (echo) is a painless test that uses sound waves to create pictures of your heart.  This test gives your doctor information about the size and shape of your heart and how well your heart's chambers and valves are working.
USB was designed to standardize the connection of computer peripherals (including keyboards, pointing devices, digital cameras, printers, portable media players, disk drives and network adapters) to personal computers, both to communicate and to supply electric power.
USB Logo. The Universal Serial Bus (USB) is a technology that allows users to connect electronic devices to a computer. It is an instant connection to the limitless possibilities of computer technology. It connects different devices if one has a standard interface. In this article, weâll take a look at what this technology enables as well as analyze the design elements in the USB logo.