The crossword solution for the term 'Voicemail Prompt' is 'TONE, ' which is a four-letter word. TONE refers to the sound of a person's voice, which can be used to convey emotion and meaning. In the context of voicemail prompts, TONE is used to create a friendly and inviting atmosphere for the caller. It can also be used to set the mood of the message, such as conveying urgency or providing a sense of calm.