Chaharshanbe Suri in tehran

The Persian name of the festival consists of čahāršanbe , the name of Wednesday in the Iranian calendars, and suri , which has two meanings; it may mean “festive” and it may also mean “scarlet” (in traditional persian and some current local dialects in Iran), which stems from the reddish theme of fire. In specific, since the fire has a basic role in this event, the latter meaning (i.e. the scarlet) makes more sense.