A regulatory buoy with a diamond symbol indicates a "danger" or "hazard" area in the water. It serves to warn mariners of potential hazards such as underwater obstructions, rocks, or areas where navigation should be avoided for safety reasons. Boaters are advised to exercise caution and steer clear of these designated areas.
Rserved Lanes
It is the symbol for Sulfer or Sulpher.
A diamond on a buoy means danger or warning. If the diamond on the regulatory buoy is open, it's a warning. It may indicate the presence of a rock, dam, wreck or other danger. Usually, the danger present is indicated under the diamond. If the diamond on the regulatory buoy is crossed, it means you should not enter. It may be a swimming area (which would be a "do not enter" area for boats), rapids, or some other danger.
carpool lane
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A diamond on a buoy means danger or warning. If the diamond on the regulatory buoy is open, it's a warning. It may indicate the presence of a rock, dam, wreck or other danger. Usually, the danger present is indicated under the diamond. If the diamond on the regulatory buoy is crossed, it means you should not enter. It may be a swimming area (which would be a "do not enter" area for boats), rapids, or some other danger.
Making an assumption that you mean in a flowchart ... it is a diamond, wider than taller like: <>
Heavy Gold Filled..
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A boat helm tattoo does not really symbolize anything specific. It could be a symbol of someone's love for boating, a sea captain or a fisherman.
A diamond symbol stamped on a gold chain could indicate that the diamond is set in the gold or that the gold chain is of high quality, possibly indicating the purity of the gold. It could also serve as a branding or hallmark from the jewelry maker.