Diver down flag. A diver down flag, or scuba flag, is a flag used on the water to indicate that there is a diver below. Two styles of flag are in use. Internationally, the code flag alfa/alpha, which is white and blue, is used to signal that the vessel has a diver down and other vessels should keep well clear at slow speed.
Familiarize yourself with some friendly network cables and take a closer look at common types of network media, including twisted-pair cable, coaxial cable, fiber-optic cable, and wireless.
The three most common headphone cables are 3.5mm, 2.5mm and 6.3mm cables. Below is a picture of each type and a summary of what each type of cable is used for. 3.5mm cables are found on most portable CD players, MP3 players and boom boxes.