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A circle with a diagonal stroke, marking a dimension as a diameter.
Also known as: Circle with a slash, Zero with a line
Sometimes confused with: Phi symbol
⌀ before a number means the dimension is a diameter, not a radius or a width. It is a distinct character from the empty set and from the Scandinavian Ø, and substituting them is common and wrong.
States that the dimension it precedes is a diameter measured across a circular feature, not a radius and not a width.
Contexts: Technical drawing
Is a distinct character, U+2300 DIAMETER SIGN, from the empty set, the Scandinavian letter Ø and the Greek phi — all of which are routinely substituted for it.
Contexts: Technical drawing, Software
Is written before the value rather than after, so a reader knows what kind of quantity is coming before they read the number.
Contexts: Technical drawing
A circle crossed by a single straight diagonal stroke running from lower left to upper right and projecting slightly beyond the circle at both ends.
Near-identical characters from unrelated fields, substituted for each other constantly.
The two ways of dimensioning a circular feature.