It means the smallest unit of time and price activity that could develop into a vertical move. One would use these minimum trends to measure market activity
and to see when a change in the market was beginning. The advantage of this concept was that the aggregation of these minimum trends would eventually indicate the beginning of a directional move. This is because the minimum trend is one-sided. It can only get bigger, never smaller. The simplicity of this attracted me. I decided to use a 3-minute price range as my version of the minimum trend.
