Lego Bionicle
Different letter sets used in the Lego Bionicle world.
The Lego Bionicle universe has a few written languages and they are simply a substitution cipher that replaces letters with symbols. The Matoran language can be written using circles or hexagons, depending on where they are used.
Metru Nui and Mata Nui
Bionicle
Bionicle
Voya Nui and Mahri Nui
Bionicle
Bionicle
There's also the Okotan symbols used on Okoto.
Okoto
Bionicle
Bionicle
These fonts were obtained from the GitHub project Bionicle-Fonts.