foot and inch marks

Use straight quotes, not curly

Foot and inch marks —also known as minute and sec­ond marks or prime and dou­ble prime marks, depend­ing on what they’re label­ing—are not curly. Use straight quotes for these marks.

But back in straight and curly quotes, you told me to turn on smart quotes. So now, when I try to type foot and inch marks, they come out curly, not straight.” A fair point.

Typog­ra­phy purists would point out that proper foot and inch marks have a slight north­east-to-south­west slope to them. True, but those char­ac­ters aren’t avail­able in many fonts. So straight quotes are the most reli­able tools for the job.