If you saw W89 after a word in the index of an encyclopedia what do think it would mean?

W89 would likely indicate a page number in an encyclopedia index.

Here's why:

* W is likely the letter of the alphabet where the topic is found (most likely "W" for words starting with "W").

* 89 is most likely the page number.

Therefore, W89 means the information on the topic you're looking for can be found on page 89 of the encyclopedia's "W" section.