The term 'KIND OF CHART OR CODE' can be solved by the 3-letter word 'BAR'. A BAR chart or BAR graph is a type of chart or graph that uses rectangular bars to represent different values or categories. It is often used to compare values between different categories, and can be used to show trends over time. BAR codes are also a type of code used to store information, usually in the form of a series of black and white lines. They are commonly used to identify products in stores.