Risk-aware consensual kink (RACK, a.k.a. risk-accepted consensual kink) is an acronym used to describe a philosophical view that is generally permissive of certain risky sexual behaviors, as long as the participants are fully aware of the risks. This is often viewed in contrast to safe, sane, and consensual which generally holds that only activities that are considered thoroughly safe, sane, and consensual are permitted to be practiced.
While many view RACK as a better educated response to SSC, it can be argued that the terms in RACK are equally subjective. "How aware is aware enough?" is a legitimate question that points to the subjectivity of RACK.
Best Practices indicate to always be very well informed about any risk you are taking, if you are not informed of the potential dangers you cannot meaningfully consent.