Who are “you”?

When the National September 11 Memorial Museum opens next month at the World Trade Center, visitors will find a stark wall separating them from a repository containing about 8,000 unidentified human remains from the 2001 terrorist attack.

On the wall is a 60-foot-long inscription, in 15-inch letters made from the steel of the twin towers: “No day shall erase you from the memory of time. Virgil.”

It sounds fitting — except in the context of Book 9 of the “Aeneid,” from which it is translated. There, a reader learns who “you” are.

“You” are not nameless. You are Nisus and Euryalus.

“You” do not number in the thousands. You are two.