There are two bands called Dio
1) Dio is a heavy metal band led by vocalist Ronnie James Dio, ex Rainbow founding member, born in Cortland, New York, who formed it in October 1982 after leaving Black Sabbath. In addition to Ronnie, Vivian Campbell played guitar; Jimmy Bain, bass; and Vinny Appice, drums.

In May 1983 they released their debut album "Holy Diver," on which Ronnie sang and played keyboards. To avoid having the vocalist stuck behind a keyboard in concert, the band recruited keyboardist Claude Schnell. Now a quintet, they released "The Last in Line" on July 2, 1984, followed by "Sacred Heart" on August 15, 1985. Several songs were recorded during the tour for that album; they were released along with the studio-recorded "Time To Burn" on the "Intermission" mini LP.

Dio is widely recognized as one of the most influential heavy metal bands still in existence, along with pioneers like Black Sabbath, in which he actually sang, Iron Maiden and Judas Priest.

Ronnie James Dio has three strengths, amongst others, a powerful and distinctive voice, a gift with metaphysical lyrics, and the integrity to stay faithful to his original vision across the decades.

Dio is also the inventor of the famous "devil horns" sign (a fist where the index finger and the smallest finger are pointing forward, like an image of a horned head). In fact, the original meaning of this sign is "Long Live Rock 'n' Roll", according to the 1980 Black Sabbath Black & Blue Joint Live Tour in New York (R.J.D. explained this himself to the audience). Furthermore, Ronnie James Dio stated in several interviews that this sign originated from his Italian grandmother; she did this sign towards the children in order to prevent bad spirits / dark forces to come near them. It could also be used when you wanted to give people an "Evil eye", a kind of curse, according to Ronnie himself.


2) The Fans of the japanese band should use Dio - distraught overlord or the unicode tag Ｄｉｏ.