What 5-letter English word
looks the same upside down
AND in a mirror?

SWIMS.. An ambigram in plain sight. Rotate it 180° — the S’s flip into S’s, the W and M swap, the I stays still. Pure typographic luck.

Question

Accepted Answer

SWIMS. — An ambigram in plain sight. Rotate it 180° — the S’s flip into S’s, the W and M swap, the I stays still. Pure typographic luck.