Unknown: - Indicates the presence of a hidden deadspace complex.
Gravimetric: - Indicates the presence of a hidden asteroid belt. These typically have rarer asteroids than can be found in the surrounding regular belts, and have the added bonus of semi-privacy.
Magnetometric: - Indicates the presence of an Archaeology/Salvage Site.
Radar: - Indicates the presence of a Hacking/Salvage Site.
Ladar: - Indicates the presence of a Complex/Gas Site.

Data - BPC's/Skillbooks or data sheets
Parts - Datacores/materials and compounds
Scrap - Scrap or Construction components (I seem to get Spatial Attunement Units's a lot)
Equipment - materials/compounds and Industrial Goods