The Submariner's insignia for most of the world's navies are the "dolphin" badge (U.S. Navy - Submarine Warfare Badge). The typical insignia denotes a pair of dolphins (traditionally dolphin fish (mahi-mahi), though bottle-nose are also used) abreast the bow of a submarine. Dolphins were chosen as they are considered not only good luck for submariners, they are also constant companions while at sea in areas where they're around.
For the U.S. Navy, the Enlisted Dolphins are silver or pewter; Officers are gold.
There is an enlisted example on my supervisor page.
The designation for my old rate is "STS", which literally stands for "Sonar Technician, Submarines". Yours truly was an STS1/SS during the top years of the Cold War. Check my bio page for pics. The Submarine Sonar community is an oddity in the Navy in that it is separate from the Surface Sonar community, though both share the same rate insignia and Naval lineage. Both have similar missions concerning ASW, but Submarine Sonar and Sonar Tech operations aboard a submarine are critical to submarine operations, whereas it's an ancillary function aboard a surface ship. The rate insignia is denoted by a pair of headphones. The surface equivalent, "STG", stands for "Sonar Technician, Guns".
Classified.
He was a US Naval Submarine Officer.
F.-O Busch has written: 'Krieg der \\' -- subject(s): German Naval operations, Naval operations, Naval operations, German, Submarine, Submarine warfare, U 110 (Submarine), World War, 1939-1945
A "Hatch" is the naval term for a door .
submrin
The Related Link I have posted below will display a large image of the Kriegsmarine insignia and have some information on their history.
Colin Mayers has written: 'Submarines, admirals and navies' -- subject(s): Naval History, Naval art and science, Naval operations, Submarine, Submarine warfare, World War, 1939-1945
The US submarine Nautilus.
The proper submarine/naval term is the Helmsman, who controls the rudder and dive planes.
David Stevens has written: 'U-boat far from home' -- subject(s): German Naval operations, Naval operations, Naval operations, German, Submarine, U 862 (Submarine), World War, 1939-1945
Gold leaf in navy rank insignia symbolizes the importance and prestige of the rank. It is a traditional symbol of honor and excellence within the naval hierarchy.