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The term that describes a progression using a two increment difference between bittings is indeed Two Step Progression. This concept is crucial in locksmithing, particularly in the design and understanding of key systems.

In a Two Step Progression, each subsequent bitting (the cuts or grooves on the key) differs by two increments from the previous bitting. This means that if you have a specific bitting, the next in the progression would skip one increment before reaching the next. This allows for a broader range of combinations while still maintaining a systematic approach in key design, ensuring efficiency in key duplication and lock functionality.

The other options do not accurately describe this specific method. For instance, Three Column Progression typically involves more than a two increment difference and is focused on different aspects of keying systems. Similarly, Active Retainer and Total Position Progression refer to different principles entirely within the locksmithing field. Understanding these distinctions is critical for mastering key progression techniques in locksmithing.