Green Tritium Outline White/Green Single Dot for Sig #8 height Green Tritium Outline: The use of green tritium is common in night sights because it provides a bright and easily visible glow in low-light conditions. White/Green Single Dot: The combination of white and green dots likely indicates a two-tone color scheme on the sight, with a white outline and a green tritium dot at the center for aiming. For Sig #8 Height: The mention of "Sig #8 height" refers to a specific sight height designed for Sig Sauer handguns. Different handgun models may have different sight heights, and the number is associated with a particular height configuration.