The word "sort" is pretty self explanatory, but here's the different sort options that could exist if you could sort your inventory, the quick menus, and possibly even the trade tables.
The Q-Menu/Inventory
--Name
---Ascending
---Descending
--Value
--Weight
--Quantity
--Most frequently used
Magic Menu
--Name
---Ascending
---Descending
--Level
--Element
--Magic type
---Spells first
---Prayers first
Equipment Menu
--Name
---Ascending
---Descending
--Attacktype
--Damage
--Weapon type
---Swords first
---Axes first
---Hammers first
---Tools first
---Armor first
---Maps first