Nothing.
It is an abbreviation for gallon, but the gallon is NOT part of the metric system.
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In the metric system, "gal" is an abbreviation for "gallon," which is a unit of volume typically used to measure liquids. One gallon is equivalent to approximately 3.785 liters.
does international system of units mean a version of the metric system used by modern scientists
1 gram is equal to 0.001 kilograms in the metric system.
The units of mass in the metric system are grams (g), kilograms (kg), and metric tons (t).
If you mean 0.001, the prefix "milli" (abbreviated "m") is used for that.
If, by 'metric system', you mean the 'SI system', then there is no base unit for volume. The unit for volume is called a 'derived unit', and it is the cubic metre (m3).