D&D4 Wiki
Attack bonus if proficient +2
Weapon die ([W]) 1d10
Type melee
Handedness two-handed
Proficiency category military
Weapon groups
Weapon properties reach, small
Price 15 gp
Weight 6 lb.

A pike is a military two-handed melee weapon in the polearm and spear weapon groups.[MME:21]

A pike has reach, so a character wielding it can make attacks other than opportunity attacks on enemies either 1 or 2 squares away. Small characters can wield a pike even though it is a two-handed weapon.

Ardents, avengers, barbarians, battleminds, fighters, paladins, rangers, wardens, and warlords are proficient with all military melee weapons, including the pike.

Other classes do not have proficiency with the pike as a class trait, but any character can become proficient by taking a Weapon Proficiency feat.