As defined by Douglas Hofstadter, ambigrams are words or symbols that convey the same or different meaning when viewed in a different orientation.
Lysergic acid diethylamide | fatty acid | acid | Lords of Acid | Velvet Acid Christ | sulfuric acid | Big O notation | The Acid House | Z notation | salicylic acid | Rosmarinic acid | Reverse Polish notation | Fatty acid | Whyte notation | Vic Acid | The Electric Kool-Aid Acid Test | The Acid House (film) | tannic acid | Sulfonic acid | Stringfellow Acid Pits | Red fuming nitric acid | Parts-per notation | Omega-3 fatty acid | Nucleic acid sequence | Mosher's acid | lysergic acid diethylamide | humic acid | gallic acid | Ethylenediaminetetraacetic acid | Dipicolinic acid |