One of the coolest pistols I have ever found is the Dardick 1100 and1500. According to Ian Hogg in Pistols of the World, Dardick came up with the idea for this unique pistol in 1949 and announced it 1954. The gun used a triangular shaped cartridge and normally fired a 38 caliber bullet. The pistol was only produced until 1962 and was ugly as sin, but it had some cool features. It had a magazine built into its grip, but fed trounds into a revolver-like apparatus. It had a long, double action trigger pull.
The trounds cases were made of plastic or aluminum. A stripper clip was used to load the trounds into the weapon.
There were "tround adapters" that allowed the pistol to use standard 38 special, 38 S&W Long, 9 mm Para, and even 22 LR rounds (with interchangeable barrels).
The Model 1100 had a 3 inch barrel and the model 1500 had a 5 inch barrel. They even offered an adapter and shoulder stock to convert the Model 1500 into a carbine. The gun held 11 to 15 trounds of ammo. The model 1500 cost 100 bucks at a time when the Colt Trooper could be had for 75 bucks. It was an expensive gun.
In any case, it was an interesting gun.