We rarely, if ever, encounter the interrobang. Wikipedia lists it as belonging to "Uncommon typography", which I guess makes sense. Then again, to paraphrase Terence, "nothing uncommon is alien to Wikipedia". The first Wikipedia entry on the interrobang is from December of 2004 slightly before Wikipedia reached its third birthday, and though it's been edited hundreds of times since, that first entry is quite extensive. Sixteen languages besides English have interrobang entries, including Hebrew, and it turns out that the most extensive edit of that entry (of three altogether) is by an editor who is also the head of the Mathematics department of Bar Ilan University. His contributions to entries related to mathematics are very extensive, but he apparently finds time for other entries as well.