Created attachment 50560 [details]
U+2261 at 8pt through 20pt
At 10 points, the top and middle lines of U+2261 (≡) are one pixel from each other, whereas the middle and bottom lines are two pixels from each other. At 11 points, this gets reversed and the bottom line becomes “double-tall”. At 12 points, all three lines become double-tall, which looks even weirder.
I have attached an image of Microsoft Word rendering U+2261 at sizes 8 through 20.