The revised design puts all information found on the original MetroCard, including customer service information and card expiration date, on the front of the card.
It is shaped like an arrow to communicate which direction the card should be entered. Since the arrow symbol is universal, even foreigners who may not read English can understand how to use the card.
A physical hole at the top indicates the top of the card. This tactile signal can allow visually impaired users to know the correct orientation.