When you look up at the Big Dipper (Ursa Major) the 2nd star in from the end of the handle is Mizar. Actually, most likely what you are seeing is both Mizar and its neighboring star Alcor - if you have medium to dark skies and good eyes, you can just recognize that it’s 2 stars not a single star. But if you take the time to really get close, you’ll see that it’s actually quite a system. Alcor is a binary system and Mizar is actually composed of 2 binary systems. I was able to resolve the 2 binaries of the Mizar double (labeled creatively enough, Mizar A and Mizar B) which visually from earth lie about 14 arc seconds apart.
A great article on these stars and their history is here: www.leosondra.cz/en/mizar/