This is a Norse rune that translates as Helm of Awe. It’s properties reputedly include: stilling anger and bringing love, as well as scattering negative thoughts and fearfulness. Traditionally it would have been worn on the forehead, or on the front of a Viking-type helmet. This image is a pendant from this American jeweller.
It reminds me a little of a snowflake and a compass and I like it a lot.