During the recent rally on the Tokyo Stock Exchange, the 225-issue Nikkei average broke the 11,000 resistance line.

The key market gauge soared 638 points to end at 11,450.22 on March 4, and has since been within touching distance of 12,000, a level unseen since early August.

The rebound followed a double-bottom price -- a support level on the chart -- reached on Feb. 6, when the Nikkei average plummeted to 9,420.85, falling below the Sept. 17 mark of 9,504.41.