U+3338 "㌸" Square Penihi Unicode Character

U+3338 "㌸" Square Penihi is a CJK compatibility ideograph from the Square Katakana block, primarily used in Japanese as an abbreviation for "Penicillin." This character is a precomposed form that encodes the Japanese word "penihi" in a single square-shaped glyph, reflecting historical encoding practices for specific pharmaceutical or technical terms in early electronic text systems. Its usage originates in older Japanese computing environments where such squares were created to save character spaces or align with specific legacy standards. While modern Unicode supports the same word through separate characters, U+3338 remains valid for compatibility with older Japanese text data.