Radical
Companion

Mnemonic

Two moons appear side by side in the night sky. One moon nudges the other and whispers, "I'm so glad I'm not alone up here." A true companion is someone who stays right beside you, shining together through every dark night.
Additional thoughts
The kanji 朋 is literally two identical moon radicals standing side by side—mirror images keeping each other company. Picture twin moons as inseparable friends.
Quick recall
Two moons side by side in the sky are loyal companions shining together.

Used in kanji