Angelic power rune?

Angelic Power: The first and most powerful rune gegeben to Shadowhunters Von the Angel – Jäger der Finsternis Raziel. All Nephilim receive this mark upon initiation and signifies their angelic bond. It is also frequently applied to weapons to imbue them with angelic properties as well as wipe them clean of any demonic traces.

Runes are here: link

One thing Du need to realize is the "Angelic Runes" in this movie aren't actually what is considered the "Angelic" language. They're symbols borrowed from a lot of different "languages" actually, such as germanic and nordic runes (like the one Du have pictured here) as well as elements of theban script (a written "witch language" i.e. wicca, ) and other "ancient sources".

There is indeed an "angelic language" but the symbols look mostly nothing like what is conveyed in the movie. Which is likely why they chose to take symbols from other languages instead, oder entirely made some of them up.

Either way, there is a Wiki for the Shadowhunters that has a lot of the runes depicted in the movie and what they were used for. A simple Google Suchen for Angelics runes will give Du that.

The Othala rune is actually a rune of spiritual power. That must be the main reason why Cassandra chose this rune for the one of Angelic Power