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My son is using his EV3 with a color sensor. He is using the sensor to test the reflectivity of different materials. Can you please tell me what the letters "PCT" stand for?

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Based on this API reference and this discussion of the color sensor it looks like "pct" is short for percent as in a ratio with 100.

David added in a comment:

EV3 hardware developer kit provides a bit more info on what 100% means:

The output from the sensor within light sensor mode is a value between 0 – 100 where 0 equals no reflected light measured and 100 equals full light reflection.

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    The EV3 hardware developer kit provides a bit more info on what 100% means: "The output from the sensor within light sensor mode is a value between 0 – 100 where 0 equals no reflected light measured and 100 equals full light reflection." – David Lechner Mar 7 '16 at 17:45

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