Power is one of the five stats core to a character's ability, along with speed, strength, destructive ability and durability. Power on this wiki is measured by the amount of energy a character can output per second. This is primarily used to measure energy blasts, but other forms of non-physical ability can also be measured through this.
Due to the extremely wide variety of ways power is used in fiction there is not an official list of power "categories" like there is for speed, strength and durability. For example, a character could have extremely high power output with ki blasts and comparatively weaker levels of output with their fireball, electricity and soundwave attacks. Making a list of all possible applications of power is impractical, and as such power is divided into different categories on a case by case basis, rather than there being universal rules for this matter.