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On the active page, I see little black boxes instead of…what?

enter image description here It didn't help that Emily's avatar is almost black too, but once inside...

EL&U Question page about *x* and *y* be  real numbers + little black box and *a* be an integer

Is this black box supposed to be a glyph or an emoji? I am like that boy in the sixth sense, I see dead boxes. Am I alone?

EDIT
Acck! I read the question, the little black boxes are supposed to be commas or blanks.

5

Looks like this is intentional: Kenny LJ used the Unicode character "black box" to mark the places that may or may not need a comma.

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