The Diablo 2 Wiki
The Diablo 2 Wiki archive is available for anyone looking for information on Diablo 2. All information here is pre-D2R but contains a lot of useful information that is still relevant. Updated sections for new D2R features can be found on the PureDiablo Diablo 2 section

Po

From Diablo 2 Wiki
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R-io po.gif

If you look at the list of all runes, you can find out the cube recipes to create a rune of one level higher than Po. Here are the Po attributes:

Rank: (r16)
Weapon: +10 Vitality
Armor/Helm/Shield: +10 Vitality
Ilvl/Clvl Required: 35