Thanks Megaspaz!) Like the left turn this is another hand signal that you should know if you have your license. Unlike the left hand turn this one is a little more tricky to figure out if you aren't familiar with it so don't expect your average car driver to know what this means.
A Single Photon Emission Computed Tomography (SPECT) scan is a type of nuclear imaging test that shows how blood flows to tissues and organs. A SPECT scan integrates two technologies to view your body: computed tomography (CT) and a radioactive material (tracer). The tracer is what allows doctors to see how blood flows to tissues and organs.
HENT in lab reports means head, eyes, nose, throat.. During a medical examination, the doctor generally observes the head, eyes, nose and throat of the patient to see if there are any problems with them. In your case, an unremarkable HENT means that your head, eyes, nose, and throat all looked fine.