What does "miscellaneous" mean?

Examples: 1. He tried put all of his notes into categories, but some didn't fit any of the categories; so he put those into a category called "Miscellaneous." 2. We had a discussion on a number of miscellaneous issues yesterday. 3. He put his socks in the top drawer, his underwear in the second drawer, his tee shirts in the third drawer, his short pants in the fourth drawer, and all the rest of his miscellaneous items in the bottom drawer. 4. She created a box of miscellaneous souvenirs that she added to every time she traveled to a new place.

What does "miscellaneous" mean? It means a mixture of items that are difficult to categorize.