That confusion is unfortunate, thanks for checking the books!

Am now a bit curious as to what the country/scientific field table with most common log notation would look like as it seems there is indeed a lot of variance...

https://mathworld.wolfram.com/Ln.html

> The United States Department of Commerce recommends that the notation lnx be used in this way to refer to the natural logarithm (Taylor 1995, p. 33).

> Unfortunately, mathematicians in the United States commonly use the symbol logx to refer to the natural logarithm, as does TraditionalForm typesetting in the Wolfram Language