Coins

Coins are the main currency of Gielinor. They allow you to buy all kinds of cool shit. Many items give you coins when alched. Many monsters also drop their weekly allowance when killed. One could also borrow money from the pockets of certain NPCs, such as Knights of Ardougne.

Players often refer to 1,000 coins as 1K, and 1,000,000 coins as 1KK. One billion (1,000,000,000) coins is know as 1KKK. This daily use of KKK has angered a lot of people with low RGB values, so Jagex is now attempting to find alternative abbreviations for billion.

The maximum stack of coins is 2,147,483,647, because Jagex could only afford to buy 32 bits. Since one gold coin weighs 6 grams (0.006 kg), a max stack would weigh approximately 12,884,902 kg. Around as much as carrying 100 raw blue whales in your inventory.

The richest man in Gielinor is currently Mod Ash, who somehow transcended the 32-bit integer limit, and gathered a venerable stack of googolplex coins.