tanh

This term is a specialized mathematical abbreviation used primarily in calculus, trigonometry, and deep learning. In the context of neural networks, it is frequently discussed as an activation function that maps input values to a range between -1 and 1, making it a zero-centered alternative to the sigmoid function.

As a technical mathematical symbol and function name, it is treated as a proper noun or a fixed label. It does not undergo pluralization or inflection in standard technical writing, as it refers to a specific, singular mathematical operation.