But what is it and how did he use it in court against sexual assault allegations?
What did Rolf Harris do?
In June 2014 Rolf Harris was convicted of 12 counts of indecent assault.
The crimes were committed against four girls – one of who was aged just seven or eight.
After he was convicted in 2014, he was subsequently jailed for five years and nine months.
His trial heard that one of the victims was a childhood friend of his daughter and another a young autograph hunter.
Judge Mr Justice Sweeney said he had taken advantage of his celebrity status and shown "no remorse".
What is his wobble board and how did he use it in court?
Rolf Harris has performed part of his song “Jake the Peg” while giving evidence at his trial for alleged indecent assaults, reported Independent.
He sung and demonstrated how to play the didgeridoo to jurors in Southwark Crown Court.
Harris described his invention of the “wobble board” to jurors.
He did an impersonation of the sound of his famous wobble board in court.
What's Rolf Harris' background?
Harris was born on March 30, 1930, in Perth, Australia, to Welsh emigrants.
He was a keen artist from a young age and a self-portrait he painted was exhibited in the Art Gallery of New South Wales when he was just 16.
He was also a championship swimmer as a youngster and won a national competition.
He came to England in 1953, aged 22, to study and a year later presented a children's art show on the BBC. He also performed piano accordion in a pub popular with Australians and New Zealanders.
In March 1958 Harris married Alwen Hughes, a Welsh sculptress and jeweller, while they were both art students.
He returned to Australia and did more TV work, before starting a recording career.
He first started to use his catchphrase – "Can you tell what it is yet?" – while on a promotional tour of Australia for Dulux, whose paints he used to create work on giant canvases for crowds.
He returned to the UK in 1962 and re-recorded his hit Tie Me Kangaroo Down, Sport even performing it with The Beatles.
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