Battle Points

Battle Points, usually shortened to BP, Points, or simply P, act as experience awarded to players after completing a multiplayer match. These count towards the player's level, and are also the determining factor in the winner of Turf War battles.

Use of Points
Points are primarily used to level up Inklings and unlock abilities. Points are also converted into cash, and can be used to purchase gear (such as clothes, shoes, and headgear) or buy weapons. Battle Points are counted at the end of every Turf War match to decide a winner, and are also used to fill the Special Gauge.

Earning
Players can earn points in Turf War, Splat Zones, and Tower Control. In all multiplayer modes except Battle Dojo, Battle Points are used to fill the Special Gauge and allow players to use their Special Weapon.

Turf War
In Turf War, points are earned by covering ground with ink. Each stage has a set number of total Battle Points, based on the amount of land available for inking. However, players may easily earn more points than this amount because ink is often recovered by the opposing team. In a given match of Turf War, the team with the most turf covered after three minutes wins. Points are awarded based on the amount of turf covered by individual players, and as a bonus, points are awarded to each player on the winning team.

Splat Zones
In Splat Zones, points are earned by knocking out the opposing team or by being the team with the least time on the clock when the match ends. 500 points are earned by a knockout, or when a team earns the 100 points needed to win the round. Even if there is no knockout, the team with the least amount of time left in the mode Splat Zones will win the game. The winning team is awarded 2,000 bonus points.

Tower Control
In Tower Control, points are earned by guiding the tower to the opposing team's base. The team with the lowest distance when the match ends wins, and is awarded one point per unit of distance the tower traveled. The winning team is awarded 2,000 bonus points.

Rainmaker
In Rainmaker, points are earned by having your team move a certain object to a point in the other team's base. The team with the lowest distance when the match ends wins, and is awarded one point per unit of distance a person travels with the Rainmaker weapon. The winning team is awarded 2,000 bonus points.

Trivia

 * In Regular Battle, players are ranked on the results screen in terms of Battle Points earned. In Ranked Battle, every team member earns the same amount of points, so players are instead ranked by the number of splats they caused and how many times they were splatted.
 * In the demo version of Splatoon shown at E3 2014, after a player splatted an opponent, the number of points earned from splatting them would show up where the player was splatted.