The MacGyver coat of arms contains several elements inspired by the show and open hardware principles. It uses Wikimedia files from the Wikipedia Heraldry Portal, so you can remix it according to heraldic rules to make your own version if you wish. There are many SVG assets available there. Note that there is a distinction between a crest and a coat of arms: the coat of arms is what goes on the shield, and the crest has other elements, including scrolls, supporters, etc.
The basic shape is the Blason vide, which is a fairly standard shape for a coat of arms. It’s also consistent with Scottish style, as befits MacGyver. (The producers started out wanting to name the character “Guy” but found it too obvious; they were also inspired by the success of the “Mc” in “McDonalds.” Of course, the Scots are renowned for their engineering prowess.) There are recognized McIver arms, which are denoted “quarterly or and gules, a bend sable” in the ~14th century programmming language used to describe arms.
Heraldry is filled with remixing and adaptation. You are encouraged to adapt these assets to make your own version of a MacGyver crest. The assets in this folder are intended for Adobe Illustrator, but tools like coamaker.com and drawshield.net are also great for brainstorming and creating your own.
