The 'tag' on this website calls it 'VIC-20', but the VIC20 user manual (Personal Computing on the VIC20) http://cini.classiccmp.org/pdf/Commodore/VIC-20%20User's%20Manual.pdf calls the VIC either VIC20, or VIC 20. The front cover is ambiguous due to the usage of the C= Commodore logo, but the first mention on page 3 definitely calls it the VIC20 with no space or hyphen, as does the subsequent mention on the table of contents page III. However, then page V calls it VIC 20 twice!
In 2021 it seems many sites have settled on the usage of "VIC 20" which is annoying as it is less efficient as a search term than using "VIC20", as "VIC 20" is treated as 2 words, and VIC-20 varies in search usage.
My personal preference is therefore to call it the VIC20 without a space or hyphen. Does anybody know what the official Commodore spelling was for the VIC?
Stickers from the actual machine show 'VIC20' for the English language version and 'VC 20' for the German version. The ones with the C= Commodore logo and the are ambiguous, as is the monochrome version. On the balance of probability it still looks to me like 'VIC20' is the most true name.