The idiomatic expression “mum’s the phrase” signifies secrecy or discretion. When connected to the idea of a “ebook,” it suggests a quantity designed for confidential record-keeping, probably containing delicate info, non-public ideas, or coded messages. An instance may be a private diary secured with a lock or a ledger detailing clandestine actions.
Such hid information have performed a significant function all through historical past, safeguarding secrets and techniques from prying eyes, preserving intimate reflections, and enabling covert communication. The necessity to shield info has pushed the event of more and more subtle strategies of concealment, from easy ciphers and hidden compartments to superior cryptographic strategies. The observe of confidential record-keeping contributes considerably to private safety, organizational technique, and historic preservation.
