Final answer:
The "B-2" refers to an aircraft model, specifically the B-2 Spirit stealth bomber developed by Northrop Grumman.
Step-by-step explanation:
In the context of "B-2 Guest Illness Shutdown," the "B-2" refers to an aircraft model. The B-2 refers to the B-2 Spirit, a stealth bomber aircraft developed by Northrop Grumman. It is known for its advanced technology and ability to evade radar detection.