Superscience

Superscience is a term GURPS 4e uses for technology that violates our current understanding of physical laws (relativity, conservation of energy, etc.) and doesn't exist as a term in the Classic Traveler setting and is denoted with a "^" in GURPS 4e. Because this technology is supposedly impossible it is effectively outside the normal TL scale meaning any TL the ^ is associated with is arbitrary.

For example, FTL travel can be TL6^, TL(6+4)^, TL10^ or something else entirely depending on the setting. This is why broadcast power has two totally different TLs in G4: TL6^ (Infinite Worlds, Gernsback) and TL10^ (Ultra-Tech).

G4TL	Transportation	Weapons and Armor	Power	Biotechnology/Medicine
^	Reactionless thrust; contragravity; faster-than-light (FTL) travel; matter transmission; parachronic technology; time machines.	Monomolecular blades; force-field technology; gravitic weapons; nuclear dampers; disintegrators.	Broadcast power; cold fusion; zero-point energy; total conversion; cosmic power.	Fast-growth clone tanks; psi drugs; regeneration ray.

Some other examples of TLX^ (from GURPS Ultra Tech) are: Cosmic Power Cells (TL12^); Holoprojection (TL10^); Contragrav (CG) Flier (TL11^); Gravity-Ripple Communicators (TL10^/11^); Mental Translator (TL12^); Gravscanners (TL9/11^); Timescanner (TL9^/11^); Rigid Dyson Sphere (TL12^) and Ringworld (TL12^)

Some technologies can be superscience depending on how they work. Macrohabitats are TL10 if they involve microgravity but TL10^ if they involve contragrav generators.

A Classic Dyson Sphere is TL11 but the more advanced Rigid Dyson Sphere and Ringworld are superscience.