Question

✿What is doublestruck?✿
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Answer 1

Step-by-step explanation:

Doublestruck

A letter of the alphabet drawn with doubled vertical strokes is called doublestruck, or sometimes blackboard bold (because doublestruck characters provide a means of indicating bold font weight when writing on a blackboard). For example, A, B, C, D, E, .... Important sets in mathematics are commonly denoted using doublestruck characters, e.g., C for the set of complex numbers, Q for the rational numbers, R for the real numbers, R^n for Euclidean n-space, and Z for the integers.

denotes any let