So what does this gold U-like symbol mean?

It’s taken over profile pics everywhere. What does it mean?

In the tradition of stealing pejorative words and symbols from the opposition it is now being used in solidarity with the Christians in Iraq who are being forced out of their homes.

Mark Shea over at Patheos has a short explanation: It Stands for “Nazarene”

There is also a story at National Review Online: A Christian Genocide Symbolized by One Letter