Recent Bottom or Concept of Nearest Support: This method is to be used as an SL for the positional strategies, preferably when you have a bullish opinion. It is the point from which the price in a downtrend suddenly starts moving upwards and a buy signal appears in the instrument, i.e., stock.
In mathematics, this is a very similar point of inflexion in a curve (polynomial of degree 2 or more).
Fig. The price marked in red colour is the point of nearest support or recent bottom, taken as SL