That's a word (I think a Latin word) that means 20 (in base 10).  So because the English used base 10 & they followed the Latin when naming things - we have this word for the technical name of a radix of 20 (base-20) numbering system.  Which the Kaktovik number system is - base 20 with a radix of 20.

And using this Kaktovik system the symbols for the radix is - 10!  Twenty.

Oh - and the proper name for a "base" is radix.  But few people use the term - maybe only mathematicians.

There are nice little inside jokes when one starts to explore multiple number systems that use different (radix) bases.  One common pun is that all bases are base-10!  And this is true - view from the perspective of the culture that uses that base.  As Eienstine said - it's All Relative!

To get very specific about number system bases - watch this: A base-neutral system for naming numbering systems.

Artifexain goes into the backstory in this video on Inventing a Number System.  I enjoyed the exploration of the symmetry in the Hindu-Arabic numerals and other creative flourishes.