The term "
1d20" is a short notation for "1 die with 20 sides". So when there is the notation of "roll
1d20" you are asked to roll an Icosahedron, or 20 sided die. 3d6 likewise
would be 3 dice of the cube type. It is even explained in the rules, usually very close to the beginning.
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Yes, a d100 is the same as 2d10 with one as the percentile. A d100 goes 1\u2013100, a d10 goes 0-9. Neither allows you to roll a 0, because of the way you count a percentile dice. (00 on the percentile and a 6 on the other dice forms 6, 00 on one and 0 on the other is 100, no option will result in 0.)
