There are also Beth numbers (<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Beth_number" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Beth_number</a>), closely related to Aleph numbers, but as far as I know that is the only place hebrew letters show up in mathematics.