The heart stands for conscience and empathy (I thought love, but I was again wrong).
The hand-bubble stands for the Voice of the People. But there's more! The five fingers, (consistent with chinese reflexology), represent honesty, fairness, a positive attitude, courage and public service. However I'm not sure if these are features of the Tan or of the People...
The glasses represent, well, glasses. However, Mr. Tan adds: "No one has ever ruined his or her eyesight by taking a long-term view".