MRT / Mass Rapid Transit
Variation 1
Finger spell "MRT".

Variation 2
Hold an arm horizontally with the palm facing down and fingers pointed to the side. Then move an "M" hand sign from side to side below the hand with the palm facing down.
Finger spell "MRT".

Hold an arm horizontally with the palm facing down and fingers pointed to the side. Then move an "M" hand sign from side to side below the hand with the palm facing down.