Random article: Gator Oscillator
Gator Oscillator is one of the indicators of technical analysis developed by Bill Williams.
Gator Indicator is represented by two bar charts situated one above another and below zero point. Upper bar charts shows the difference between jaw and teeth of Alligator (moving averages with periods of 13 and 8 respectively), bottom bar chart shows the distance between Alligator's teeth and lips ( moving averages with periods of 8 and 5).
Bar charts can be red or deep blue depending on value of previous column (watch MACD indicator): red column is above the previous one, green is located below.