A combination of two favorite symbols. The heart from which the cross emerges signifies the love of God for us, and the love we return to God, through his son Jesus. It is also a reminder - from your heart let the cross flow out and up in love to others.
But in your hearts set apart Christ as Lord. Always be prepared to give an answer to everyone who asks you to give the reason for the hope that you have. But do this with gentleness and respect... 1 Peter 3:15