An old or broken thing that can't be used anymore is called a scrap.
When we throw away something because it's no good anymore, like an old toy with missing pieces or a torn-up book, we say it's been scrapped. People also use scraps to make new things, like reusing old wood to build a table or creating a collage from cut-out magazine pictures. Sometimes, scraps are even sold for recycling or reused in creative ways by artists and crafters. In this sense, scraps can be useful again, just not as originally intended.
How common is "scrap"?
Word scrap is considered uncommon in modern English. It has a balanced usage among all categories: speech, fiction, newspapers and academic texts.
Definitions
noun
A (small) piece; a fragment; a detached, incomplete portion.
Example: I found a scrap of cloth to patch the hole.
(usually in the plural) Leftover food.
Example: Give the scraps to the animals: any meat to the dogs, and the rest to the hogs.
The crisp substance that remains after drying out animal fat.
Example: pork scraps
(uncountable) Discarded objects (especially metal) that may be dismantled to recover their constituent materials, junk.
Example: That car isn't good for anything but scrap.
(UK, in the plural) A piece of deep-fried batter left over from frying fish, sometimes sold with chips.
(uncountable) Loose-leaf tobacco of a low grade, such as sweepings left over from handling higher grades.
(ethnic slur, offensive) A Hispanic criminal, especially a Mexican or one affiliated with the Sureno gang.