How the four pics resembles alphabet. Can anyone explain? I can only see there is just some Greek letters like omega and pi and one soup picture?
The four pictures have one common theme:
Starting in the upper left corner, going clockwise, we have
1. the Greek letter $\pi$
2. the Greek letter $\Omega$
3. alphabet soup
4. the Greek letters $A$ (alpha) and $\Omega$
You almost answered your own question yourself... In the first picture you see Pi, which is the greek letter equivalent to the English P; in the second, you see Omega, which is the last letter of the Greek alphabet, and is pronounced similarly to a long "o"; in the third, you see an A and an Omega, which belong respectively to the modern English alphabet and the Greek alphabet; and lastly, you have a spoonful of letter soup.