A maths symbol is hidden in the below Bar Graph. Can you decipher it?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

Imagine you are in a room with no windows or doors. How will you get out?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

How is a fly different from a mosquito?

There was a blind man. He had four socks in his drawer either black or white. He opened it and took out two socks. Now the probability that it was a pair of white socks is 1/2.

Can you find out the probability that he had taken out a pair of black socks ?

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

What number when divided in half becomes zero?

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.