Weapon Damage Multipliers
The base damage of a weapon is the amount of damage the target should take on each successful hit. Some weapons' item card Damage stat will show the base damage and a multiplier, represented by flashing yellow multiplier text (such as "x7") alternating with the damage number. If a multiplier is present, the weapon will fire the number of projectiles given by the modifier for each trigger squeeze. Take note that in some cases, certain features of the weapon will lead to the consumption of more than one unit of ammunition expended per shot fired.
The most common type of weapon to show damage multiplier stats are Shotguns, firing several pellets per shot (the number of pellets varies according to Shotgun type). Other weapon types can have a damage modifier, but in such cases these are special features rather than a typical feature of the weapon.
Comparing a single-shot Rocket Launcher to a Helix Rocket Launcher:
A normal Rocket Launcher with 500 damage and a 3 round magazine. With every pull of the trigger, 1 rocket is fired and will do 500 damage to its target and 1 round of Launcher ammo will be used, its potential damage per magazine adds up to 1,500.
A Helix Rocket Launcher with 200 damage with a x3 modifier, and a 3 round magazine. With every pull of the trigger, 3 micro-rockets will fire at the target in a spiraling pattern doing 200 damage per micro-rocket if the target is hit and 1 round of Launcher ammo will be used, its potential damage per magazine adds up to 1,800.