Runes may enscribed onto weapons, armour, standards, war machines and talismans. Each of these has its own type of rune.
A character may not have more than one runic magic item or one magic item from each category (for Dwarfs, armour and shields count as one category).
A Dwarf character may carry ordinary magic items and runic magic items at the same time, but the total number of magic items he may carry is limited as normal.
Rule of the Runes
Up to three runes may be enscribed onto a runic magic item, subject to the following restrictions:
No item may have more than three runes.
Weapon runes may only be enscribed on weapons, armour runes may only be enscribed on armour, etc.
No more than one magic item may carry the same rune/combination of runes.
No master rune may be used more than once, and no more than one master rune can be enscribed on one item.
With the exception of master runes, runes may be combined together and used in multiples.
Runes may not be enscribed onto existing magic items.
For the full rules for Dwarf runes see Warhammer Armies - Dwarfs.