Which term describes a tool to keep track of on-call hours?

The term that best describes a tool used to keep track of on-call hours is a timecard. A timecard is specifically designed for recording the hours worked by an individual, making it particularly useful in scenarios where tracking hours, including on-call times, is essential for payroll or operational purposes. Timecards can capture specific details like start and end times, breaks, and total hours worked, allowing for precise tracking of time commitment.

In contrast, other options do not serve this specific purpose as effectively. An invoice is more focused on billing for services rendered rather than tracking work hours. A ledger, while useful for keeping financial records or transactions, doesn’t specifically track hours worked. A logbook can serve various purposes, including recording events or activities, but it’s not typically structured for the specific and detailed purpose of tracking on-call hours in a professional setting. This makes timecards the most suitable choice for monitoring work hours, especially in contexts that require accountability for on-call duties.