KanjiJLPT N2
Universal

universal, wide(ly), generally, Prussia

Mnemonic

Imagine every person on Earth told to line up facing the sun. Billions standing shoulder to shoulder, all bathed in the same golden light — a truly universal moment. The sun shines on every single one in the line up, playing no favorites, no exceptions.
Additional thoughts
Visualize humanity in one enormous row facing a massive sunrise — the radical Line Up sits on top of Sun in the kanji, just like people standing atop a horizon lit by dawn. Universal = line up + sun.
Quick recall
All of humanity line ups before the sun in one universal dawn.

Details

The keyword for 普 is universal. This kanji conveys the idea of something that is widespread, general, or applicable to all without exception. It carries the sense of being common to everyone or everything, suggesting a broad, all-encompassing reach. It is often associated with concepts of universality, normalcy, and general prevalence across all situations or people.
On'yomi
Kun'yomi
あまね.く、あまねし

Used in kanji