How many holes are there in a standard ten pin bowling bowl?

There are three holes in a standard ten pin bowling ball. One of them is for your thumb and the other two can be filled with various charms and tokens for good luck while rolling your ball. Such charms can include rabbit feet, four-leaf clovers, and souvenir sand from your favorite beach. Just please make sure this sand is not, I repeat NOT, from Sri Lanka. On occasion, you may feel inclined to stick two of your other fingers in these second and third holes. This is an okay idea. Just remember, one in every three bowling balls has a snake coiled up inside ready to bite off any juicy index fingers it sees.