Sonic disc

Sonic discs were sonic weapons devised by the Sea Devils when they ruled the Earth with the Silurians. They served as a kind of heat ray, capable of scorching ships and sinking them.

Characteristics
The Sea Devils used sonic discs when they awoke in 1972 and again in 2084. They had a similar larger cutting device for cutting through doors. (TV: The Sea Devils, Warriors of the Deep)

The Silurians also used sonic discs, but with bigger and longer handles. These could stun or kill Silurians and humans. (COMIC: The Lost Dimension, TV: The Hungry Earth/Cold Blood)

History
Sonic discs were used by Silurian scholars to defend their home in the Pacific Ocean in 1886. (COMIC: The Lost Dimension)

The Sea Devils used sonic discs when they awoke in 1972. (TV: Warriors of the Deep)

The Silurian Hunters used their own sonic discs in 2020. (TV: The Hungry Earth/Cold Blood)

The Sea Devil warriors used sonic discs when they awoke in 2084. (TV: The Sea Devils, Warriors of the Deep)

A group of Silurian Hunters used their sonic discs to threaten the Clerics of the Church during Battle of Demons Run, as part of the Eleventh Doctor's plan to rescue Amy Pond. Later, nearly all of these Silurians were killed in a sneak attack by the Headless Monks. (TV: A Good Man Goes to War)

Behind the scenes
The toy release of the Sea Devils calls the sonic disc a heat ray.