"A keystone is the architectural piece at the crown of a vault or arch which marks its apex, locking the other pieces into position." Wikipedia
Having a strong support system has been invaluable to me in the early stages of my business. This is not only important on a personal level but also on a professional one. I work amongst boards of well wishes, jokes, photographs and memorabilia and they keep me going when i'm so tired I start sewing my fingers together.
My best buddies also made me a good luck video when I left London and started up the business: