Soletta is a memetic word in English, an empty gravity well in the lexicographic space. It is commonly used for naming brands and products. There is a Soletta hot tub, professional hoof trimmer, gramophone (now defunct), Sakura Wars character, framework for making IoT devices, watch, shoe, and fabric, among others. It's not just English; Soletta is a Chilean game company, and a Swiss car (now defunct). Soletta is the Italian word for an insole, and the Italian name for the Swiss city of Solothurn.
But we're not here to talk abut any of that.
Soletta was the name Kim Stanley Robinson gave to the reflecting mirrors used to help heat the atmosphere of Mars in his book Green Mars. It was planned to later add a magnifying lens to focus part of the incoming light from the soletta, to melt the sand and regolith, thus releasing volatiles into the atmosphere. Probably because of this, Soletta is also the name of the AI weather satellite in Terragenesis.
But even before that, in the late 1970s, Krafft A. Ehricke, a German rocket scientist and early advocate for space colonization, proposed a soletta of his own; his Soletta or 'little sun' was a collection of large mirrors built in orbit around the Earth to reflect sunlight to the surface, aiding in agriculture and solar energy, potentially allowing for around-the-clock sunlight in targeted areas, although he planned on the intensity of light being only 50% of daylight. The cost, calculated in 1980 dollars at ~240 billion US dollars to light 2700 square kilometers (1047 sq. mi.) of Earth's surface, failed to attract funding.
Ideas of this sort are still around, but the terminology has changed; these days we would probably call both Krafft A. Ehricke's and Kim Stanley Robinson's devices a space mirror.