Vinculum
ellipsis. ...
a repeating or recurring decimal
That's a repeating decimal. Some people call it a recurring decimal.
Call this number "x", then write:x = 0.275275275... 1000x = 275.275275275... Subtract the first equation from the second, and solve for "x". That will give you "x" as a fraction.
A bar.
Vinculum
a event that occurs over and over
Irrational.
REPEATING
It is called a repeating decimal.
a repeating or recurring decimal
ellipsis. ...
echo
a repeating or recurring decimal
This structure is called a large lattice.
A polymer.