The 621 is last in a dimensional series of semiregular polytopes and honeycombs, identified in 1900 by Thorold Gosset.
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This honeycomb is last in the series of Thorold Gosset in 1900, listing polytopes and honeycombs constructed entirely of regular facets, although his list ended with the 8-dimensional the Euclidean honeycomb, 521.
honeycomb | Honeycomb (song) | Honeycomb | Tesseractic honeycomb | Honeycomb toffee | Honeycomb (geometry) | Hanna–Honeycomb House |