Exceptions to the rule that only one ring may be worn per hand are the ring of weakness and the cursed ring.
(appears to be unique to D&D94?)
Can only be removed by a high level cleric.
Causes a -1 penalty to all Saving Throws.
Does not detect as evil.
Have 1d10 charges (D&D74 wands have up to 100 charges)
Rods and Staves
Rods are intermediate in size between a wand and a staff.
Staves and Rods apparently have unlimited charges unless specified.
The only rod listed is a Rod of Cancellation
Gimping the number of charges a wand can potentially have may seem like a good idea, my concern is that individual wands may seem like disposable items if they only have an average of 5 charges.
There are no "Rods" in D&D74. I don't think they add much to the game, but whatever. It is strange that staves and rods have no charge limits in D&D94, given how reduced the charges of wands are.