abstract, advertise, advertisement, advice, alarm, alert, announce, announcement, attention, background, beware, black, blank, blue, bubble, bubble speech, caution, danger, dangerous, design, discovery, error, exclamation, exclamation mark, frame, hazard, icon, info, information, mark, message, mistake, notice, notification, point, problem, risk, safety, security, shape, sign, space, speech, speech bubble, stop, symbol, wallpaper, warn, wooden, yellow