A picture of the Cadillac logo may be found online at the Cadillac website. It als also found on many Cadillac fan websites, or on the brand's facebook page.
The Vista logo is the same as the Windows logo. It is part of the Microsoft Windows franchise. Therefore, the Vista logo is the shape of a window in a circle.
The logo is the shape of a house. The HG part starts for "Home and Garden."
Cadillac did in the past, and Ford had a very prominent V logo on their V8 trucks up until the late 60s, IIRC.
the Chicago cubs (the c on their hats at least)
Mickey mouse
wiskas
GLAXOSMITHKLINE
SAP
Two golden arches in the shape of an 'M'.
ellipse
The answer is sap