Ab2ab2 26.4k1313 gold badges7272 silver badges105105 bronze badges 10 And while in the 60s, in my Latin course we chanted the connected Ubi, ubi est meus sub ubi? bib The natural numbers form a established, typically symbolized for a bold N or blackboard bold ⁠ N displaystyle mathbb N Bea https://spinesafecapsulesforspine.blogspot.com