I think it depends on where you are seeing this. I'm assuming it is in the desktop software for your dive logs or maybe it is on the dive computer. There is no definitive standard for what people use as standards. North American convention is red for danger and yellow for warning. So a red symbol means you did something the computer REALLY was not happy with. On some computers this is just a stern warning. On others it means the computer locked you out for 24 hours.
Some people advocate 30ft/second. Some say 60ft/second until you reach 30 feet. Then it switches to 30ft/second. You'd have to consult the dive computer manual to see what they advocate. Realistically, when buying a computer, I know what conventions I like to follow (12 hours before flight or 24 hours before flight? 30ft/second or 60ft/second? 1.4 to 1.6 ppo2 when diving Nitrox?) and I like to see a computer which follows the same conventions or can be programmed to follow my conventions.
Bottom line, where ever you are seeing the icons, that software should have an associated manual that explains the icons.
Darrell