There are 5 types of currency in Melvor Idle. For all of these currencies, there is no limit to the amount the player can have.
Gold Pieces (GP) and 
Slayer Coins (SC) are used to purchase items, upgrades, and equipment from the Shop. These can be obtained and used within the Melvor Realm.
Abyssal Pieces (AP) and
Abyssal Slayer Coins (ASC) are obtained exclusively within the
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Into the Abyss expansion. Much like GP and SC, they are used to purchase items, upgrades, and equipment from the
Shop.
Raid Coins (RC) are used to purchase upgrades and skip waves for the Golbin Raid minigame.
Settings
Number formatting can be changed in the Settings menu under interface settings. Currency numbers below 100,000 are not abbreviated, numbers 100,000 in size or above will have the last three digits replaced with the letter K. K is shorthand for thousand, so 100K represents one hundred thousand. Numbers 10,000,000 in size or above will have the last six digits replaced with M. M is shorthand for million, so 10M represents ten million. Numbers 10,000,000,000 in size or above will have the last nine digits replaced with B. B is shorthand for billion, so 10B represents ten billion.
Combat:
