The Image Hose is a special brush that applies images instead of color. The images it "paints" with come from special image files called nozzles. Each nozzle file contains multiple images that are organized by characteristics such as size, color, and angle. Each characteristic (parameter) can be linked to a stylus attribute (animator), such as Velocity, Pressure, and Direction. For more information, see Image Hose controls and Image hose.
The name of each Image Hose variant tells you which parameter and animator are in effect. For example, the Linear-Size-P Angle-R brush variant links size to stylus pressure (P) and sets the angle randomly (R).