It isn't a typo, that refers to the wheels bolts, 5 with 1.5mm thread pitch. But it should really be 12 x 1.5mm as that covers the diameter and the thread pitch.
As an aside, now that we have the rims understood, I would like to go to tires. When you have decided on what size tires, please check the manufacturer's website for specifications on the tires. All tires are not created equal. A 245mm width tire is not exactly 245mm. First it is rounded to the nearest ten mm. Also this measurement changes depending on the width of the measuring rim. For example my 245 tires are actually 249mm on the measured rim width of 8.5 inches. The wider the rim a tire is measured on makes the tire wider as well. So if you put 245mm Yokohamas on a 8.5 inch rim and they don't rub, if you put them on a 9 inch rim they might. Also if you changed from a Yokohama to a Michelin in the same size they might rub as well. Even changing model of tires from the same manufacturer could cause them to rub. I had this happen with Michelin tires, the same size. The replacement model rubbed, when the original didn't, this was an original equipment wheel and original tire size.