Variant forms of a radical are provided together (ex. 47. 巛川) or listed in two lines if they look very different (ex. 64. 手 and 64'. 扌). Simplified forms are given after a slash. (For example, number 187: 馬/马). The character examples are all traditional characters.
This list is such a common standard that sometimes radicals are referred to by number alone. A reference to radical 189, for example, without additional context, means 高.