When I look at pictures of similar icons in Orthodox churches in the US, they all use the word "protection." The most simple is "Holy Protection." The more complicated names had many more adjectives.
After that, it would depend on who the audience is.
If this is for a group of people who have some knowledge of Orthodox Christianity, I would say something like "Protecting Veil of the Holy Theotokos" or "Protection of our Most Holy Theotokos." If it is for a broader group of people (who might not know anything about the religion at all) I would say "Protecting Veil of the Holy Mother."