the Vortex Indicator consists of two oscillators that capture positive and negative trend movement. Despite a rather involved formula, the indicator is quite straightforward to understand and easy to interpret. A bullish signal triggers when the positive trend indicator crosses above the negative trend indicator or a key level. A bearish signal triggers when the negative trend indicator crosses above the positive trend indicator or a key level. The Vortex Indicator is either above or below these levels, which means it always has a clear bullish or bearish bias.