In the section on Line Ends, https://code.sgo.to/typograms/ shows a box surrounded by arrows and a dot surrounded by arrows.

The arrows that point down (down and left, down, and down and right) are rendering the arrow heads as ascii V's.

That seems different than elsewhere on the page.

    \ | /
 \   vvv   /           \ | /
  v+-----+v             vvv
 ->|     |<-           ->*<-
  ^+-----+^             ^^^
 /   ^^^   \           / | \
    / | \