Metaphasic shield

A metaphasic shield was a type of shield that could be used by a starship or shuttlecraft to approach a star safely.

In 2369, Reyga, a Ferengi scientist, worked with the crew of the USS Enterprise (NCC-1701-D) to test a metaphasic shield. Jo'Bril killed Reyga and attempted to make steal the technology for his people, the Takarans. Jo'Bril was stopped by Beverly Crusher, who proved the technology worked. 

Geordi LaForge later developed metaphasic shielding for the Enterprise which enabled the Enterprise to hide in the corona of a star from a Borg ship. 

In 2370, the Helios managed to steal a metaphasic shield from a Ferengi trader and used it to hide in a star's corona when the Cardassians pursued them. 

In 2371, Chakotay ordered the shields of the USS Voyager to be modified to be metaphasic shields for Voyager to enter the corona of a G2 star.