Therefore sign

1, p. 211  Other authors in the 18th century also used three dots in a triangle shape to signify "therefore", but as with Rahn, there was little consistency as to how the triangle was oriented; because with its current meaning appears to have originated in the 19th century.

In the 20th century, the three-dot notation for 'therefore' became very rare in continental Europe, but it remains popular in Anglophone countries.

[1] Used in a syllogism: and in mathematics: In meteorology, the therefore sign is used to indicate "moderate rain" on a station model; the similar typographic symbol asterism (⁂, three asterisks) indicates moderate snow.

Its purpose is to "indicate minor breaks in text", to call attention to a passage, or to separate sub-chapters in a book.

On some maps, a version of the sign with thicker dots, ⛬, is used to signal the presence of a national monument, historic site or ruins; it has its own Unicode code point.