Truncation

When referring to numbers, truncation is the removal of insignificant digits from the end of a number.

In RuneScape, large quantities of items (most often coins) have their numbers truncated to reduce the number of characters required to show the quantity of an item in a stack.

Convention
For stacks of items containing less than 100,000, the amount is rendered precisely, such as "31633", and the examine text is that of an individual item. For stacks 100,000 or more, the examine text displays the exact number of items in a stack, and the following conventions are used to display the quantity in a bank or inventory slot:

The maximum quantity of an item a player can hold in a stack is 2,147,483,647, as limited by a 32-bit integer. It should be noted that these truncation conventions are also applied to items other than gold.