also: さんてんリーダ
noun
three dot leader; ellipsis
In printing and typography, refers to a row of three dots used as a leader or to indicate an ellipsis.
目次で三点リーダーを使ってページ番号を揃える。
In the table of contents, use a three dot leader to align the page numbers.
三点リーダーは、省略や間を表す記号としても使われる。
The three dot leader is also used as a symbol to indicate omission or a pause.
リーダー alone refers to a leader (typographic dots) in general, while 三点リーダー specifically means a three-dot leader.
省略記号 is a broader term for ellipsis or omission marks, not limited to the three-dot form.
From 三点 (three dots) + リーダー (leader, from English 'leader').