What weapons can Death knights use?

Currently, Death knights can use:
1-handed swords
2-handed swords
1-handed axes
2-handed axes
1-handed maces
2-handed maces
Polearms

one-handed and two-handed maces must be acquired through training within major cities, while all of the other weapon proficiencies are available when you create your death knight.

They can also dual-wield, though at this point it appears that dual wielding will have no significant advantages or disadvantages compared to using a 2handed weapon. Most death knights will probably end up using a 2hander out of popular preference and preconceived notions of what a death knight should wield.

It should be noted that deathknights cannot use shields or ranged weapons. The ranged weapon slot is taken up by items known as "sigils", which provide improvements to the death knight's abilities similar to the idols, totems, and librams available to other hybrids.