Which of the following is NOT a fire pattern technique?

The correct answer highlights a technique that does not fit within the established fire pattern techniques used in fire investigations.

In fire dynamics, techniques such as Frontal, Depth, and Cross are recognized ways to understand and analyze how fire spreads and its potential patterns. "Frontal" often refers to methods where the fire moves directly ahead, creating a path that can be analyzed for fire spread dynamics. "Depth" examines how fire impacts different layers or materials, which can reflect the intensity and direction of the fire's heat and smoke. "Cross" looks at the interaction of heat between areas experiencing different fire conditions, helping to understand how fires can influence one another in a shared environment.

On the other hand, "Surround" is not recognized as a standard fire pattern technique in this context. It generally does not describe a specific pattern of fire spread but could imply an unrelated concept about encircling something, which does not align with the technical terminology typically used in fire investigation.

Thus, the distinction lies in the recognition and application of the terms within fire investigation practices, making it clear that 'Surround' falls outside the commonly accepted techniques.