It may be that Voynich wanted to include a hint of 'heraldry' in his catalogues to enhance his position and status among those in high places (both political and financial), though this is pure conjecture on my part.
One last point to consider is that Voynich was familiar with Alchabitius, with listed references in catalogue 2 (1003) and 3 (1563). A footnote in the 1003 entry states "Alchabitius, a corruption of 'Abd Al' Aziz Jbn'Uthmian [Al Kabisi.]" (p.258)
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