Orange is vibrant. It's a combination of red and yellow so it shares some common attributes with those colors.
It denotes energy, warmth, and the sun. But orange has a bit less intensity or aggression than red, calmed by the cheerfulness of yellow. As a warm color orange is a stimulant - stimulating the emotions and even the appetite.
If you want to get noticed without screaming, consider the color orange -
it demands attention.