[jsuar]

I agree.

"Every few minutes, a line with the current value for S(h, t) is emitted."

Hard to believe the author didn't notice this...

Maybe just some humor for the trending classification overview?

[JamesMcMinn]

I doubt it was done deliberately to be funny - using S for Score, h for Hashtag and t for time are about as standard as you could get.

[jsuar]

True. I guess it's just coincidental humor for some readers.