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A natural ambigram (or strobogrammatic word) is an English word that reads identically when rotated 180 degrees (turned upside-down).
Ambigrams are famous in typography and graphic art, popularized by Douglas Hofstadter and John Langdon. While most ambigrams require custom calligraphy, certain English words are "natural ambigrams"—their standard typeface letter glyphs possess 180° rotational symmetry or map into corresponding rotation pairs (such as s, o, x, z, l, i, and pairs like m/w, d/p, b/q, n/u). Words like "swims", "solos", and "dollop" can be turned completely upside down and remain fully readable.
Authentic words that read identically when rotated upside down
6-letter noun denoting a lump or portion that inverts cleanly.
The classic natural English ambigram (s-w-i-m-s upside-down is s-w-i-m-s).
5-letter plural for solitary musical performances.
Midday 12:00 term reading identically under 180° rotation.
Test any English word to check if its glyphs preserve 180° rotational symmetry:
Verified English words exemplifying natural ambigrams (rotational symmetry) with Scrabble scores
Linguistic definitions, etymological origins, and tournament usage
A natural ambigram retains its legibility and identity when turned completely upside down (rotated 180 degrees) without requiring decorative calligraphy.