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A circled 'wf' marking a character set in the wrong typeface.
Also known as: Wrong typeface mark
A circled 'wf' in the margin with the offending character ringed in the text. A relic of metal typesetting, where a single sort from the wrong case could find its way into a line and nobody would notice until proof.
A circled 'wf' in the margin with the affected character ringed in the text, instructing that it be reset in the correct typeface.
A relic of metal typesetting, where a single sort from the wrong font could be picked up into a line and would not be noticed until a proof was pulled. Digital typesetting makes the fault far rarer but not impossible.
The letters w and f written inside a circle in the margin, with a ring drawn around the affected character in the line.