'Rim' in the Bible

“These are the measurements of the altar in units of length (each unit being the standard length plus three inches): the gutter is 21 inches deep and 21 inches wide, with a rim of nine inches around its edge. This is the base of the altar.

The ledge is 24½ feet long by 24½ feet wide, with four equal sides. The rim all around it is 10½ inches, and its gutter is 21 inches all around it. The altar’s steps face east.”

“You must take some of its blood and apply it to the four horns of the altar, the four corners of the ledge, and all around the rim. In this way you will purify the altar and make atonement for it.