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2 unique codes for 2 characters:

Native Symbola [1] Code UTF-8 UTF-16 LE Name Cat Block
# # 0023 23 23 00 NUMBER SIGN Po Basic Latin
20E3 E2 83 A3 E3 20 COMBINING ENCLOSING KEYCAP Me Combining Diacritical Marks for Symbols

2 Unicode blocks:

Name Range Chart
Basic Latin 0000-007F PDF
Combining Diacritical Marks for Symbols 20D0-20FF PDF