Prototype

* Armor and clothing:
** Prototype medic power armor, a U.S. Army variant of T-45d power armor in Fallout 3.
** Prototype hazmat suit, a prototype hazmat suit in Fallout 76.
* Miscellaneous items:
** Prototype X-13 boots, a quest item part of the stealth suit Mk II in the Fallout: New Vegas add-on Old World Blues.
** Prototype X-13 chest plate, a quest item and part of the stealth suit Mk II in the Fallout: New Vegas add-on Old World Blues.
** Prototype X-13 gloves, a quest item and part of the stealth suit Mk II in the Fallout: New Vegas add-on Old World Blues.
* Weapons:
** AER14 prototype, an energy weapon in Fallout: New Vegas.
** Tesla-Beaton prototype, a unique weapon in Fallout: New Vegas.
** Prototype UP77 "Limitless Potential", a unique weapon in Fallout 4.
** Pulse rifle prototype, an energy weapon in Fallout Tactics.
* World objects:
** Prototype Mister Handy, an antique world object in Fallout: New Vegas.
** Prototype sentry bot, an antique world object in Fallout: New Vegas.
** Prototype eyebot, an antique world object in Fallout: New Vegas.
** Stealth Boy Mark II prototype, an enhanced Stealth Boy in Fallout: New Vegas.
* Other:
** MPLX "Novasurge" prototype plasma pistol, a paper note in the Fallout 3 add-on Mothership Zeta.
** Vault prototype, a prototype for the Corporate Vault and the main base of the Texas Brotherhood of Steel in Fallout: Brotherhood of Steel.