“Equality” is one minus the Gini coefficient of household income per household member after taxes and transfers. A value of 0 would represent an infinitesimal proportion of people getting all the income, and 1 would represent everyone having the same income. 0.32 is a very small value: the most unequal countries on Earth these days have values of about 0.38, and those are very undeveloped countries in Africa, in the South Africa to Botswana range.
It is strictly an economic measure, hence its placement in the table. It does not (directly) take social or political inequality into account (though those do of course produce economic inequality, which does get included).
P.S. It looks as though the USA has an “equality” of about 0.62. So the get the equivalent of Navabharata you could take half of the income from every family in America and give it all to whomever currently has the most income.
Suppose that 99% of the population all had the same income, and that the remaining 1% each had 200 times as much. The Gini coefficient of income would be 0.34.