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Penetron
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<p>The penetron, short for penetration tube, is a type of limited-color <a href="/facts/Television/X4YG5nT1">television</a> used in some military applications. Unlike a conventional <a href="/facts/Color_television/Un5dDuF7">color television</a>, the penetron produces a limited <a href="/facts/Gamut/bRQc2fCr">color gamut</a>, typically two colors and their combination. Penetrons, and other military-only <a href="/facts/Cathode_ray_tube/8NVGx5C7">cathode ray tubes</a> (CRTs), have been replaced by <a href="/facts/LCD/8B6xGBEz">LCDs</a> in modern designs. </p>