Raider ordinance armor is a variant of the raider armor. The breast cups on the female model appear to be hollowed out mini nukes with the red tips removed or painted over, while the male variant has the back end of the mini nuke's stabilizer fins tied over their chest.
The name of the armor likely was intended to refer to ordnance, but was misspelled as ordinance.
If the player character moves the armor into the air, then tries to drop it, it may remain floating in the air. They cannot pick it up, although jumping into it seems to make it glitch back onto the ground, where they can.
The following is based on unverified behind the scenes information and has not been confirmed by canon sources.
The female version of this armor mimics the artwork seen on many planes during the Second World War which showcased women riding on bombs or wearing them as clothing. This is a trend which has continued to this day through comic books, and films such as Tank Girl.
End of information based on unverified behind the scenes information.