This came up rather randomly in CyanChat.
Fonts on my computer that happen to support the Interrobang: Arial Unicode MS, BlairMdITC TT, Bradley Hand ITC TT, Calibri, Cambria, Candara, Consolas, Constantia, Corbel, Courier, DejaVu Sans Mono, DejaVu Serif, Geneva, Helvetica, Lucida Grande, Lucida Sans Unicode, Meiryo, Mona Lisa Solid ITC TT, Monaco, MS Gothic, MS Mincho, Savoye LET, Stone Sans ITC TT, Stone Sans Sem ITC TT and Apple Symbols.
I would have been surprised if it had been even more than one or two. But more than two dozen? Nice!
Incidentally, myst-bert points to a list of fonts that support this character.
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