mc - "a miscarriage (particularly used in online forums)"
- the symbol for moscovium (atomic number: 115)
The text "MC" is the most mysterious part of the name of Netflix error code 152: "NFErr_MC_AquireLicenseFailure"; this probably extends to "Netflix Error Mobile Content Acquire License Failure", for this error happens on mobile devices such as an iPhone. Related error message on Netflix on iPhone from late 2017 or early 2018:
Error A problem occurred while playing this item. Try again later, or select a different item. Go to www.netflix.com/support for more information. (152:NFErr_MC_AquireLicense Failure)