stupid question regarding pistols...

It means the weapon is prohibited and you need a special permit to own them. The permits are no longer issued and the only people that have them are grandfathered.
 
Barrels under 105mm and calibre .25 and .32. were prohibited in 1995. If you owned one before February 1995 and continue to own one, you can buy and sell these 12(6) "prohibs" amongst other grandfathered people.
It was a not-so-subtle way to slowly eradicate a whole group of handguns.
 
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