Damage Amplifier

The Damage Amplifier (just Amplifier, or UDamage) is a power-up that enhances the player's weapon damage. It also makes a distinctive sound when picked up, and every time a weapon fires to alert enemies that someone is using it. It is much sought after in multiplayer games.

Unreal
In Unreal the Amplifier resembles a battery and only enhances energy weapons; the Dispersion Pistol and ASMD.

Unreal Tournament
The Damage Amplifier looks like a spinning, gold symbol, the same as used by the green team in multiplayer games.

Unreal Tournament 2003 and 2004
UT2003 and UT2004's Double Damage pickup resembles that of UT, but is purple. It looks somewhat like a hologram. Players carrying it look purple as well.

Unreal Tournament 3
UT3's Damage Amplifier will be similar to that of UT2004.

Unreal Championship
UC's Damage Amplifier is similar to that in UT2003.

Unreal Championship 2
In UC2 the amplifier is referred to as "UDamage" (Unreal Damage). It is purple, but has a somewhat more technical look.