Nazar - the 'evil eye'

Nazar نذر  (Not to be confused with نظر  nazar - look, glance, opinion, consideration) 

The concept of the 'evil eye' is widespread throughout Central Asia, and can often be seen painted on the side of jingle trucks:

The painting of an eye is supposed to protect the drivers, occupants, or cargo from harm’s way or bad things on the road. It is believed that by praising or looking at an object or a person with envy, you may unintentionally harm the object or the person.  When expressing appreciation of someone or something, you could add “Masha-Allah”  ما شاء الله  (God has willed it) so that you won’t be seen as envious or “giving the evil eye.”  Some people also use نام خدا (naam-e khoda).  For example, “Nice car, buddy!  Masha-Allah”

Here's some more information on the topic from Wikipedia:

A couple of words that are mentioned in the Wiki article:

Angels  فرشته  (farishta)

Devil شيتان (shaytaan)