US are radios locked to the channels and TX power or EIRP limitations for the United States
EU are radios locked to the channels and TX power or EIRP limitations for Europe
ISED are radios locked to the channels and TX power or EIRP limitations for Canada
ROW are radios that can be set to any regulatory region and stands for Rest of World. ROW radios are not typically allowed to be purchased in US, EU, or ISED regions.
For Australia, you’d purchase ROW radios and set the region to Oceania → Australia. After setting the proper region, the radio will only have the channels and TX or EIRP allowed for that region. You can always go back and change the region however.
All above radios have AES-128 encryption included, and the ability to purchase an AES-256 key where allowed by law.
No encryption radios are for ROW radios destined for countries that the US has encryption export restrictions on, like Cuba, Iran, North Korea, Sudan, Syria.