I know the buttons are displays of some sort and variable - but the current numbers displayed seem a bit out of whack... Lets use dice glyphs!, oh wait only 6 dice glyphs, so 7 next, oh I know lets use Roman numerals, so Viii after that... hmm dont know how to do 0 in Roman numerals - lets just go with 9 and 0 at the end....
--edit--
Wow I'm tired and grouchy. Ignore above comment, it's just groggy ramblings

- goodnight!