Etoile Cross or Creation Cross
"Etoile" is the name given to a star-shaped figure, where the star's rays have wavy edges. The star typically has six rays and is seen most commonly in heraldry, rather than in a Christian context. But this doesn't preclude us from considering the religious importance of "six".
The number is significant in all Abrahamic religions not least in the story of Creation, recorded in Gen. 1:26-31 (the Hexaemeron), showing that God created mankind on the sixth day. This was after God had created the universe, including a home planet for us to live on, and stocked the pantry all ready for us.
God entrusted us to look after the world, which you'll agree we're not making a very good job of.
God also gave each of us our own personal spiritual world, which again, we tend to make quite a mess of. But fortunately God created for us something very special, that can make our hearts pure. This 'something' is, of course, the gift of the Crucifixion.
"Therefore, if anyone is in Christ, the new creation has come." (2 Cor. 5:17)
The Jewish Star of David also has six points but the design is fundamentally different, since the star is formed by two intersecting triangles rather than six rays. Also the six points have no particular religious significance to Jews, unlike Seven. (The Star of David is a relatively modern design from the late 19th century, with no ancient tradition. See the Emblem of Israel)
