As noted below, its simply a certain size of wire and AWG stands for American Wire Gauge.
A typical old tractor battery powered coil distributor ignition may carry like 4 amps maximum and 20 AWG wire should handle that SUBJECT TO temperature and if in free air or enclosed etc. etc.
Often on an old tractor I might (like OLD) use bigger wire just for its physical strength such as say 14 AWG instead of 20 and theres no harm if you would use 14 AWG for a 4 amp load.
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