I apologize for the grave mistake.

It's really more an acute mistake.

I apologize for the acute mistake.

Just in case some people don’t get the joke: https://blog.duolingo.com/french-accent-marks-pronunciation/

I love hackernews

I didn't know there was a Unicode code point for that! I'd always thought one should just use straight quotes for inches. Thanks!

Straight quotes are acceptable too: https://practicaltypography.com/foot-and-inch-marks.html

That was exactly the reference I turned up—though I (shamefully) didn't read far enough to see the mention of proper foot and inch marks, only the initial recommendation to use straight quotes.