The catalogue of bar patterns that reveal professional buying — the bullish counterparts to Signs of Weakness. Each SOS is presented in a three-part protocol: Bar Description (the specific volume, spread, and close-position characteristics), Background Context (the conditions required for the signal to be valid), and Future Expectations (what should happen next and what would invalidate the signal). Core categories include Test (and variants Basic Test, Test After Shake-Out, Test After Up-Thrust, Test of Breakout, Test in a Rising Market), Stopping Volume, Selling Climax, Shake-Out, Absorption Volume, No Selling Pressure, Falling Pressure, Professional Support (Reverse Up-Thrust), Demand Overcoming Supply, No Supply, Bag Holding, Bottom Reversal, and Two-Bar Reversal. True strength always appears on down-bars.