Zenit Polar is a simple encryption system, which consists of replacing the letters of a word with their corresponding in the name ZENIT POLAR.
If the letter has no correspondent in “polar zenit”, it remains.

That is, the 'Z' is replaced by 'P' and vice versa; the 'E' is replaced by 'O' and vice versa; the 'N' is replaced by 'L' and vice versa, and so on.

For example, the word Application would be Iznacirave.

This encryption was used extensively in World War II.