What does does this rebus picture means ?

Write the next letter in this sequence.
O, T, T, F, F, S, S, E, __
**Hint: It is a Number Series Puzzle

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

In a supermarket, there is an intelligent glass pane before a refrigerating unit. This glass pane allows cherries and apples through it but does not allow grapes and Orange to pass through it.

Can you identify the rule that the glass pane is following?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

In the image below, can you find the value of an angle(y)

All of Jacob's shoes are red except two.
All of Jacob's shoes are green except two.
All of Jacob's shoes are yellow except two.

How many shoes does Jacob have?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Can you spot the hidden girl in the picture below?