Open the font → Font Info → PS Names. Look for UniqueID or FullName. If you see “ArialNormal” and “Version 701”, you have found the exact artifact.
This refers to the specific style family and weight. arialnormal opentype truetype version 701 western
The "Western" tag in the metadata is a utility warning for international projects. Open the font → Font Info → PS Names
Standard Arial (Western) supports the Windows-1252 encoding. It does not support Cyrillic (Russian), Greek, or complex scripts like Arabic or Thai natively—those require "Arial Unicode MS" or specific localized versions of Arial. This refers to the specific style family and weight
If you are coding a website or app and your users see "tofu" (□ □ □) characters when typing in Polish or Czech, it suggests the system is falling back to a "Western" restricted version of the font rather than a pan-European version.