PS—preliminary support, where substantial buying begins to provide pronounced support after a prolonged down-move. Volume increases and price spread widens, signaling that the down-move may be approaching its end.
SC—selling climax, the point at which widening spread and selling pressure usually climaxes, as heavy or panicky selling by the public is being absorbed by larger professional interests at or near a bottom. Often price will close well off the low in a SC, reflecting the buying by these large interests.
AR—automatic rally, which occurs because intense selling pressure has greatly diminished. A wave of buying easily pushes prices up; this is further fueled by short covering. The high of this rally will help define the upper boundary of an accumulation TR.
"…all the fluctuations in the market and in all the various stocks should be studied as if they were the result of one man’s operations. Let us call him the Composite Man, who, in theory, sits behind the scenes and manipulates the stocks to your disadvantage if you do not understand the game as he plays it; and to your great profit if you do understand it." (The Richard D. Wyckoff Course in Stock Market Science and Technique, section 9, p. 1-2)