I had an idea this afternoon about a new oscillator and just finished putting it together. It is based on Tom DeMark's TD Combo countdown rules. I plan on doing some backtesting in the near future but for now I'll show it using a 40 day period. It seems to act like the RSI indicator, where it stays above 50 in bull markets and often sinks below it, without getting back to the highs, in bear markets. I have plenty of work to do on this.