reverse (left) arrow in an algorithm?

Question

There is a algorithm, in which author has written steps of algorithm like this,

1. Initialization: Set up the threshold (th) and maximum iteration number, I.

   i ← 0

2. Calculate x

   While (x > th) do

       i ← i+1

       ...

   End While

What does this left arrow means here?

Answer 1

The left arrow statement here that the value i+1 is stored in the variable i.

That is, i is incremented by 1.

Answer 2

Left arrow (as well as right one) means assignment, in your case an equivalent C# code is

  i = 0;

  while (x > th) {
    i = i + 1;
    ...
  }