HMS Triad
Several warships of the British Royal Navy were named HMS Triad from the English word for triad:
- HMS Triad (yacht) was a yacht. The ship served General Hamilton as a reconnaissance vehicle in the Battle of Gallipoli.
- HMS Triad (N53) was a T-class submarine. The boat was launched in 1939 and was sunk by an Italian submarine in the Mediterranean in 1940.