Zhe (Ж, ж) is the letter of Cyrillic alphabet
Zhe is most often transliterated as zh (as in Doctor Zhivago), more rarely as zx, except in Serbian and Macedonian and some transliteration systems of Bulgarian where it is most often transliterated as ž, or, lacking diacritics, simply as z.

The closest Polish counterpart is ż.

Zhe is one of the first letters learned by children who learn to write in Slavic languages, because it looks quite like a young frog floating in a pond, and in these languages the word meaning "frog" or "toad" is written "жаба".

(from Wikipedia)
I remember that from Russian Class, interesting that Mikhail was in charge of the drop and it's a Russian symbol - and Ms. Klugh was speaking Russian to him.

__________________