阳 is used in: 太阳 (sun), 阳光 (sunshine/sunny personality), 阳台 (balcony). In philosophy: 阴阳 (yin-yang). Many Chinese city names contain 阳: 沈阳, 洛阳, 贵阳.
culture
阴阳 (yīn-yáng) is a fundamental concept in Chinese philosophy. 阳 represents the bright, warm, active, masculine principle — the complement to 阴 (dark, cool, passive).