Purple flags are a common sight along the coast -- warning of dangerous sea creatures nearby.
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But to be more specific, the flags now feature images of a jellyfish and a stingray -- to help swimmers get the message.
Swimmers fled the surf earlier this week after a group of stinging jellyfish passed through.
The purple flag expands warnings to swimmers beyond the red banner that's flown when rip currents are present. A yellow flag also warns of heavy shore break or dangerous currents.
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David Elder, supervisor of Kill Devil Hills Ocean Rescue, said he asked the business Islander Flags in Kitty Hawk to add images of the creatures to be more specific.
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Shark alerts are not included because they're rare and unpredictable.
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"You're more likely to be struck by lightning than be bit by a shark," Elder said.
Jellyfish can inject people with venom. Stingrays can strike with a poisonous barb.