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triangle more often to mean 'therefore'. 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. Use of an upright triangle exclusively to mean therefore (and an inverted triangle exclusively to mean because) 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

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