Market Profile Chart, ... So for example, the letter “A” might represent the first 30 minutes of trading, the letter “B” would represent the next 30 minutes, and so on.

A price by volume (PBV) chart is a horizontal histogram plotted on a security's chart, showing the volume of shares traded at a specific price level.

A chart of accounts (COA) ... For example, a company may decide to code assets from 100 to 199, liabilities from 200 to 299, equity from 300 to 399, and so forth.