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3 lines
453 B
Plaintext
3 lines
453 B
Plaintext
What are unfilled letters with inner and outer thin outlines usually called? Double struck. Some of these symbols are used to represent sets of natural, integer, rational, complex, and other numbers, such as [U:2115], [U:2124], [U:211A].
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Other double-stroke symbols, such as the double-struck italic uppercase letter "D", do not have a strictly defined purpose. You can use them for writing formulas and calculations, as well as for decorating text. |