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◌ is U+25CC DOTTED CIRCLE. Unicode uses a dotted circle in its character charts to show where a combining mark sits relative to a base character. The circle in that chart illustration is not part of the mark itself. Separately, the encoded U+25CC character can be used as a visible base when an isolated combining mark needs to be displayed.
What is the dotted circle?
The symbol ◌ has the Unicode name DOTTED CIRCLE and code point U+25CC. It is a character in its own right, not merely a decorative outline attached to an accent. Unicode lists it in its Geometric Shapes chart.
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Its frequent appearance beside an accent or other combining mark can be confusing because the circle may be serving one of two different roles: it can be a chart convention that demonstrates mark placement, or it can be the actual U+25CC character used as a base in text.
Why Unicode charts show a dotted circle with combining marks
Combining marks are generally positioned in relation to a base character. In Unicode code charts, a dotted circle illustrates the approximate location of that base relative to the mark. The circle is a visual aid; it is not normally part of the representative glyph for the combining mark. Unicode explains this convention in Chapter 24 of the Unicode 17.0.0 Standard.
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So when a chart shows a mark over, under, or beside ◌, read the circle as a placement guide—not as an instruction that the combining mark itself contains a dotted circle.
When U+25CC is used as a real character
An isolated combining mark can be difficult to display meaningfully without a base. Unicode says U+25CC is often selected as the base when such a mark needs to be shown on its own. In that case, the dotted circle is an actual character in the text, with the combining mark positioned in relation to it; it is not just the chart’s illustration.
This does not mean every app automatically inserts U+25CC whenever it encounters an isolated or unsupported mark. The Unicode description covers chart notation and the explicit choice of a dotted-circle base; behavior in a particular app depends on its text-processing and rendering implementation.
Why the displayed mark can vary
The precise appearance and placement of a combining mark depend on the font and rendering system. Microsoft’s guidance for fonts used with its Universal Shaping Engine recommends that fonts support a U+25CC glyph, but that recommendation is specific to that engine and should not be treated as a universal rule for every font or platform. See Microsoft’s Universal Shaping Engine font guidance.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A bidirectional-text caveat
Unicode 18 notes a specific layout issue: a base character with neutral directionality, such as a dotted circle, can become separated from certain combining marks during bidirectional ordering. This is a caveat about bidi layout, not evidence that U+25CC or combining marks generally fail. The warning appears in Chapter 7 of the Unicode 18.0.0 Standard.
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