The letter “R” in bubble letters is a rounded, soft, and playful version of the regular capital or small “R.” Instead of sharp edges and straight lines, bubble letters use thick, curved strokes that make the letter look puffy, like it is filled with air. In bubble style, the straight line of “R” becomes bold and smooth, the curved top looks more circular, and the leg extends outward in a rounded way. People often use bubble letter R in graffiti art, school projects, posters, and creative handwriting because it looks fun, eye-catching, and easy to decorate with colors or patterns.