A punctuation symbol representing a horizontal ellipsis (three dots) for indicating omitted terms in mathematical expressions.
Examples
Indicating a continuing pattern in a sequence
1, 2, 3, \text{\textellipsis}, n
Showing omitted terms in a summation
\sum_{i=1}^n (x_1 + x_2 + \text{\textellipsis} + x_n)
Indicating continuation in a set definition
\{2, 4, 6, 8, \text{\textellipsis}, 100\}