It's mentioned in the article in the following:
When the military finally arrested her in 1970, Rousseff, now 62, says she was severely tortured in order to give up secrets.
She told Istoe magazine in 2008 that as a prisoner she was often tied up to the infamous "parrot's perch," a torture device used by Brazil's military police in which the victim is suspended between two metal platforms.
"They gave me electrical shocks, a lot of electrical shocks," Rousseff told Istoe. "I began to hemorrhage, but I withstood. I wouldn't even tell them where I lived," she said.
http://www.brazzil.com.nyud.net:8090/images/stories/2004/nov04/parrots_perch_torture.jpg
""Tortura nunca mais" (Torture never again)
This is a monument constructed by the human rights group "TORTURA NUNCA MAIS." This monument depicts the atrocity of torture showing a victim of the "pau de arrara," the infamous "parrot's perch" torture rack, widely used in Brazil during the Military dictatorial regime in the late 60’s and 70’s."Wikipedia:
Torture technique
Pau de arara can also refer to a physical torture technique designed to cause severe joint and muscle pain, as well as headaches, and psychological trauma. The technique consists of a tube, bar, or pole placed over the victim's biceps and behind the knees while tying the victim's both ankles and wrists together. The entire assembly is suspended between two metal platforms forming what looks like a parrot's perch.
This technique is believed to originate from Portuguese slave traders, which used Pau de arara as a form of punishment for disobedient slaves. Its usage has been more recently widespread by the agents of the political police of the Brazilian military dictatorship against political dissidents in the 1960s and 1970s and it still believed to be in use by Brazilian police forces<1>, although outlawed<1>. The device was often used as a restraint for a combination of other torture techniques, such as water boarding, nail pulling, branding, electric shocks, and sexual torture.
http://en.wikipedia.org/wiki/Pau_de_Arara