ARB

Gini: how unevenly the token is spread over its holders. 0 is every holder holding the same, 1 is one holder holding everything; above 0.9 a few accounts hold nearly all of it.

Holders: accounts with a balance beyond dust. Dust is what the dust setting hides: a holding worth under 5 cents, or, for a token without a price, a sliver of one unit. With dust hidden, the median and the Gini are over these holders; with dust shown, over every holder.

Top 10 and top 100 hold: their share of all the units held. Holders for half: how few of the largest hold half of it between them. Median holding: the holding in the middle, half of the holders hold less.

By rank: the largest holders in bands, and what each band holds of all that is held; the token account's own holding counts as any other.