Fixing meta icons

I want to put the little meta icon net to the meta items in my blog http://www.energyanalysis.org

First, I dont’ understand why such a large category ID, 171657751, appears to work in this css code, even though I do not see this category ID anywhere in my categories when i hover mouse over them:

#categories-171657751 ul {
	list-style-type: none;
	margin: 0px 0px 10px 0px;
	padding: 0px 0px 0px 0px;

	}

#categories-171657751 ul ul {
	list-style-type: none;
	margin: 0px 0px 0px 0px;
	padding: 0px 0px 0px 0px;
	}

#categories-171657751 ul li {
	background: #FFFFFF url(images/icon_categories.gif) no-repeat top left;
	padding: 0px 0px 0px 18px;
	margin: 0px 0px 0px 0px;
	}

Second, how might I fix this css code to make the meta icon image show up? Is there a code ID that I need to find again?

#meta ul {
	list-style-type: none;
	margin: 0px 0px 10px 0px;
	padding: 0px 0px 0px 0px;
	}

#meta ul ul {
	list-style-type: none;
	margin: 0px 0px 10px 0px;
	padding: 0px 0px 0px 0px;
	}

#meta ul li {
	background: #FFFFFF url(images/icon_meta.gif) no-repeat top left;
	padding: 0px 0px 0px 18px;
	margin: 0px 0px 0px 0px;
	}