What is "reliables"

Usage examples of "reliables".

One of the science-fiction guys he was always dragging home from the library, one of his old reliables, perfect for the long afternoons of summer vacation.

In a galactic civilization, minor human mutations could result in major immune reactions to relatively innocuous viruses that refused to respond even with an immense pharmacopoeia and therapeutics cunningly developed from old-world reliables and alien innovations.

I kept phone calls to a minimum, shaved and showered only as necessary, let Charlie and Gil answer the door, and made a science of the economies I could produce by giving up the humble reliables of my life.