Price keeps making new highs, but each advance is smaller than the last while pullbacks stay shallow. The two converging boundaries slope upward. The interpretation is that demand is weakening even though price is still rising.
In an uptrend a rising wedge is treated as a possible exhaustion; in a downtrend it is treated as a continuation-pattern, the rising drift being a corrective bounce. Completion is a close below the lower boundary.
Wedges are among the most subjectively drawn patterns, and the rising wedge in particular gets called on any orderly advance by traders who want to be bearish. Requiring at least two touches on each boundary, and a close below with follow-through, filters out a lot of wishful drawing.
Related: falling-wedge, broadening-formation, symmetrical-triangle, reversal-pattern, trendline