What is the abbreviation "ef" is?

Ākāsa1 -ānañca (or ânañca): the infinity ef space

perhaps it’s just a typo in “the infinity of space”?


I also think the same way.

Pali-English dictionary author has already pass away.
I seem to be born too late.

*I am not familiar with the English language. So I use Google translator.

Ākāsa1 -ānañca (or ānañca) the infinity ef space