The Unicode character U+3390, displayed as ㎐ and named "Square Hz" is located in the CJK Compatibility block. This character was introduced in Unicode version 1.1 (1993). Find its HTML entities, UTF-8/UTF-16 encodings, hex values, and copy-paste details below.
㎐㎐U+3390;13200\003390\u3390\x{3390}\u{3390}u'\u3390'E38E90339000003390