What other kind of .357 would it be in a Glock as the .357 Sig is the only option.
Unless there are multiple chamberings of said caliber if looks like they just stick with the numbers. IE the 21 says .45Auto while the other .45 reads .45GAP. The 19 says 9x19 as there are multiple 9X_ Glocks such as the 9X17. The .40 just says .40, not .40S&W.