Most posters an signs are with Iranian letters. Some are strange and special, like:
Picture of martyrs This picture scares me!
A sign I saw from the bus but was not able to take a picture said of (in English): “A woman’s hijab is more valuable than a martyr’s blood.” Honestly, I don’t know the meaning or interpretation.
Some are difficult to understand:
and some signs are decorative:
Sign in the ceiling in all the hotel rooms I stayed in Iran showing th direction to Mecca,