Gun pills: why is it called a .38 Special?

Why the .38 Special is defined as "Special", and is  a .38, even if it shoots a .357 caliber bullet?

A History of the Iconic .38 Special - The Shooter's Log

Al Capone gun on display at Mob Museum - The Mob Museum

Pierangelo Tendas

Military, Page 3

Sold at Auction: Smith & Wesson;, SMITH & WESSON MODEL 15-3 .38

Colt Detective Special - Internet Movie Firearms Database - Guns

The Most Versatile Handgun Caliber — The .357 Magnum - The

Top Short-Barrel .38 Special Ammo for Personal Protection

What are the 10 Best Revolvers of All Time? - Shooting Times

Does a .38 special have enough punch to kill a man? - Quora

Military, Page 3

Gun pills: why is it called a .38 Special?

Not that we do away with .38 special but why don't firearm makers

Colt New Service - Wikipedia