It is called a tittle, and it doesn't stand for anything. It was added to make the i and the j easier to read.
Damage Over Time
DOT stands for Department of Transportation.
"Dot" stands for ".".
Department of transportation.
a city
Cities, town, villages and the larger the dot the bigger the populace would be.
.co.uk is the United Kingdom domain.
.computer .commercial
'merbs.elite.rejected.critics'.ca
Department Of Transportation
It stands for the United States Department of Transportation.
It would be 0.7961 with a bar over the 7961. Using dot notation it would be 0.7961 with a dot over the 7 and another dot over the 1.