Battle Angel Alita Wiki

The Mark of Zalem is a special symbol embellished on the forehead of Tiphareans (the people of Zalem).

BAALO01 141 Nova II

The mark is not known to serve any purpose other than to indicate that the bearer is a Tipharean citizen.

In the manga, the mark is a tattoo.

In the 2019 film, the mark is a purple gem-like implant.