The Quatrefoil. It's so 1400.

The quartrefoil shape is defined as "four leaves" and has been used as a decorative and symbolic motif for centuries. Most associated with Gothic and Renaissance architecture, the quaterfoil has seen a resurgence in popularity. Here are a few instances that I particularly like:

1. Quatrefoil Headboard from Horchow

2. Paul Morelli Pearl & Diamond Quatrefoil Earclips

3. Quatrefoil Wallpaper from Seabrook

4. DIY Upcycled Quatrefoil Dresser from Kreative Knack