What term is used to describe a letter in which an employee notifies their employer of their resignation?

The term "letter of resignation" specifically refers to a formal document an employee submits to their employer to communicate their intention to leave their job. This letter often outlines the employee's final working day and serves as an official record of the resignation. Using this term highlights the professionalism and clarity of the resignation process, which can help maintain a positive relationship between the employee and employer as they part ways.

The other options, while related to the idea of resigning, do not capture the formal nature or accepted terminology of this process as accurately. A notice of termination generally refers to an employer's action to terminate an employee, rather than a resignation by the employee. A resignation note sounds informal and less professional than a letter of resignation, which is typically expected in business contexts. An employment withdrawal letter would imply that an individual is retracting a job application rather than resigning from an existing position.