Lapel Pin Cross
or Witness Cross
There are innumerable designs of cross that can be worn as a pin. The simple Latin Cross (shown on the left) is perhaps the most common. Variations include crosses adorned with some other feature, or coloured, or worn in conjunction with a coloured ribbon to Christianise their campaign, such as the AIDS Cross.
The Lapel Pin Cross, even when used to promote a campaign, is usually not called a Campaign Cross; that term is almost invariably used for military campaign medals.
People often wear a Lapel Pin Cross or Witness Cross as a symbol of their Christianity. The cross is so distinctive and recognisable, that more often than not, people know the wearer has a message to tell.
And the wearer realises that their own enthusiasm for Jesus is not shared by everybody. The Lapel Pin Cross, subtle though it is, can appear as in-your-face evangelism. That might, of course, be a motive for wearing one, or defiance against the current rabid secular campaign to deny religious symbols.
You could easily forget you're wearing it, especially if your favourite team has just lost a game, or you've missed the train and late for work, or suffering toothache, or such incidents which often happen in life at the same time. That doesn't put you in the mood for reacting appropriately when somebody says "So you're a Christian. What's your perspective on same sex marriage?" Or, "My lovely cat's just died. Will she go to heaven?
Whether or not you wear a Pin Cross, your faith is one of those things that people will recognise from the way you live. As St. Francis of Assisi said, "Preach the Gospel of Christ to all; use words if you must."