The word is F.A.S.T.: Face, Arm, Speech, Time
That is, as explained by the National Stroke Association:
F = FaceAwareness of the signs and symptoms of a stroke are key to saving a life - yours or someone else's.
• Ask the person to smile. Does one side of the face droop?
A = Arms
• Ask the person to raise both arms. Does one arm drift downward?
S = Speech
• Ask the person to repeat a simple sentence. Are the words slurred? Can the person repeat the sentence correctly?
T = Time
• If the person shows any of these symptoms, time is important. Call 911 or get to the hospital fast. Brain cells are dying.