Symbols:H/Quaternions/Historical Note
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Historical Note on Symbol for Quaternions
The symbol $\Bbb H$ was selected to denote the set of quaternions in honour of William Rowan Hamilton.
Of course, $\Q$ could not be used, because it had already been adopted to stand for the set of rational numbers.
Sources
- 2021: Richard Earl and James Nicholson: The Concise Oxford Dictionary of Mathematics (6th ed.) ... (previous) ... (next): $\Bbb H$