Quote :
"Use to indicate an action in progress ("Downloading…") or
incomplete or truncated text. No space before the ellipses.
Omit from menu items or buttons that open a dialog or start
some other process.
Midline ellipses (three-bullet glyphs) are also used to represent
numeric truncation and the redaction of sensitive data, such as
credit cards."
https://material.google.com/style/writing.htmlCloses#5887
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