noun
manual
MAN-yoo-ul/mˈænjuʌl/
A book giving instructions or reference information.
The manual's diagrams show how to assemble the lamp parts beside it.

Etymology
A manual was literally a book suited to the hand: small enough to carry or use conveniently in one hand. This became the general term for a concise handbook of information or instructions.
In context
please bear in mind that these rules come from the chicago manual of style they are pretty run-of-the-mill however the list of capitalization rules is massive
More examples
- Check the owner's manual for the recommended tire pressure.
- New employees receive training manuals on their first day.
- I keep a grammar manual beside my desk.
Forms
manual · manuals