In the language of libraries, MARC, 245 is the code for a title.
So if you’re looking through MARC records, full of indecipherable numbers and their corresponding entries, you might see 245 A wrinkle in time
MARC was created in the ’60s (“Machine Readable Coding) so it is quite dated nowadays, but it sticks around because it’s still doing the trick for libraries and has been the standard in the US since the ’70s.
