Angelic power rune?

Angelic Power: The first and most powerful rune given to Shadowhunters by the Angel 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 you 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 you 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, or 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 search for Angelics runes will give you 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