Flag for the Tibetan Language

The flag for the Tibetan Language differs from the ethnic flag for Tibet.  It indicates language and nothing of political aspirations or Tibetan ethnic preferences.

Flag for the Vietnamese Language

Not to be confused with Vietnamese nationalism, the language flag for Vietnamese is based upon the flag of Vietnam in the canton but with a language field of blue and sea-green.

Maori Language Flag

Hawaiian Language Flag

Flag for the Quechua Language

RTG Plutonium Flag from The Martian - 2015

Perhaps the most unique flag in the movie The Martian 2015 - is the Plutonium marker flag.  It is pennant with metallic hoist.  The field is yellow.  It has a green spoke working symbol with a black skull and cross bones on the center.

Usually we see people in science fiction movies about Mars, planting flags on this planet.  But in The Martian we see our hero un-planting a flag. 

Flag for the Portuguese Language