WiFi regdomain ETSI vs ETSI2

jbo@

Developer
Could somebody explain to me the difference between ETSI and ETSI2 as the setting the regdomain on a WiFi interface?

I generally understand what ETSI is. But I was confused seeing ETSI2 in the handbook.

According to /etc/regdomain.xml, there also appears to be an ETSI3.
 
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