If global TPC maximum transmit power for 802.11a/n/ac is set to 10 dBm, which configured power level approximately doubles the transmit power?

In wireless communication, every 3 dB increase in power approximately doubles the transmit power. Therefore, to double the transmit power from 10 dBm, you need to add 3 dBm, resulting in 13 dBm. 14 dBm would be slightly more than double. 17 dBm would represent a power increase of 7 dBm, which is more than four times the original power (3 dBm doubles, another 3 dBm doubles again, so 6 dBm is four times). 20 dBm would be a 10 dBm increase, which is ten times the original power.