Combining Clockwise Ring Overlay

It overlays the symbol immediately before it with a clockwise ring.

A 1999 Unicode discussion showed ring overlays building contour, surface, and volume integral notation, and paired this clockwise mark with an integral sign for clockwise travel around a contour—a path around a region. This base-plus-mark construction does not make the pair a canonical decomposition of ∲.

Why does the mark need a base?

It needs a base symbol and a font that positions marks well.

Place ⃙ after its intended base in the text sequence. A combining mark has no separate baseline advance, so by itself it may show with a dotted-circle carrier or fail to produce a useful reading.

Whether the overlay lands neatly depends on font support. Treat it as notation markup, not an accent for ordinary letters.

Where did ringed integral notation come from?

Printed integral signs developed through several forms.

A historical account records the ordinary integral sign in Cauchy’s 1846 paper. It locates Wilson’s earliest cited circle-below examples in books from 1901, 1909, 1911, and 1912, followed by a middle-circle form in Sommerfeld’s 1917 paper. These printed forms document contour-integral notation over time; they do not establish the history of this combining mark itself.