• 普及ふきゅう — spread; popularization
• 普段ふだん — usual; everyday
• 普通ふつう — normal; regular
• 普遍ふへん — universal; general
• 普請ふしん — construction; repair (archaic)

普 joins the sun radical 日 with a pattern that means “lined up” or “spread out.” Imagine sunlight extending evenly across the land — a perfect image for something widespread or universal.

Think of 普及（ふきゅう） — when something spreads so widely that it becomes part of daily life. 普 brings the image of sunlight reaching everywhere, and 及 means to extend or reach out. Together, they describe the natural flow of ideas, tools, or customs spreading across society — like warmth spreading at dawn.