What is the origin of the anchor as a Christian symbol, and why do we no longer use it?

I have heard [the Christian musician] Michael Card say that the anchor was a primary Christian symbol until about 400 AD. Is this correct? And what is the origin of the symbol? —Dick The anchor became a key Christian symbol during the period of Roman persecution. As Michael Card observes in his recent album, Soul … Continue reading What is the origin of the anchor as a Christian symbol, and why do we no longer use it?