What is a common tool used in shaving?

The common tool used in shaving is a razor or electric shaver because these instruments are specifically designed to cut hair at the skin's surface, allowing for a smooth and close shave. Razors can be straight or safety razors that utilize sharp blades, while electric shavers use oscillating blades to achieve a similar effect without the need for water or shaving cream in many cases. These tools are widely available and are the standard choices in both personal grooming and professional settings for shaving facial hair, body hair, and more.

The other tools listed, while they may have uses in hair removal, do not pertain specifically to shaving. Scissors are intended for cutting hair but are not designed for the close shave that a razor offers. Thread is used primarily in a technique called threading, which is an effective method for eyebrow shaping and double chin areas but is not suitable for general shaving. Wax strips are designed for a different hair removal approach, specifically for pulling hair from the root, offering long-lasting results but not a shave. Therefore, the razor or electric shaver stands out as the primary tool for shaving.