smile
囅 centers on a smile, specifically a broad or open smile. The single given meaning is straightforward, but the kanji is rare and its usage is limited.
囅 is a rare character. It combines 單 (possibly phonetic) with 展 (possibly semantic, suggesting opening or spreading), but the exact historical development is uncertain.
The left side 單 looks like a face with a wide mouth, and the right side 展 suggests spreading or opening. Imagine a face spreading into a broad smile.
For テン, picture a person smiling broadly while holding up ten fingers: ten -> テン, and the smile spreads across their face.
—