Polarization cloak
A polarization cloak was a sophisticated cloaking device used by Ramuran tracers to hide themselves and their ships. It used a sophisticated polarization technique that causes sensor scans to pass right through it.

Tracer ships could fire weapons through the cloak, while remaining untargetable themselves. 
However, the presence of cloaked ships might be deduced through proton surges.

The personal version of a polarization cloak could be disrupted by a magneton sweep.

In 2374, the former tracer  modified the  sensors to penetrate the Ramuran polarization cloaks, albeit only for a brief time. ()

de: Polarisationstarnung
Shield technology