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UK wire gauge - the higher the number the thinner the wire. So 25 would be thinner than 22.
For a stranded cable: Use a micrometre or vernier gauge to measure 1 strand; this gives you the diameter of the strand. Halve this figure for the radius, square the number and multiply by pi. (pi r squared is the area of a circle). Finally multiply the result by the number of strands which then gives you the true csa of the stranded cable.
There are a number different gauges for different products. For steel sheets, the gauge ranges from 3 to 38. For aluminum, the gauge ranges from 6 zeroes to 40.
20 gauge? Unless if your wanting to know exactly what the deminsions are like in thousandths of an inch.