Collar pin
From Wikipedia, the free encyclopedia
A collar pin (closely related to the collar bar and collar clip) is a piece of men's jewelry, which holds the two ends of a dress shirt collar together and passes underneath the knot of a necktie. Functioning in a similar way as a tabbed collar, it keeps the collar in place and lifts the knot to provide a more aesthetically pleasing arc to the necktie.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/f/f7/Brearley%2C_Norman_%281920s%29.jpg)