"Western" refers to the Latin 1 character set (Western European), though Arial itself supports a broad range of scripts including Greek, Cyrillic, and Arabic. Key Technical Details
In font naming tables, “Western” is a legacy combination: arialnormal opentype truetype version 701 western top
that uses OpenType wrappers for better cross-platform compatibility. Version 7.01 "Western" refers to the Latin 1 character set
that looked like the popular Helvetica but didn't require expensive licensing fees. The Inspiration arialnormal opentype truetype version 701 western top