Note that IANA tags used for BCP-47 language tagging distinguish these two variants of Armenian:<div><span class="Apple-style-span" style="font-family:Times;font-size:medium"><pre style="word-wrap:break-word;white-space:pre-wrap">
Type: variant
Subtag: arevela
Description: Eastern Armenian
Added: 2006-09-18
Prefix: hy
%%
Type: variant
Subtag: arevmda
Description: Western Armenian
Added: 2006-09-18
Prefix: hy
%%
</pre><div>(from <a href="http://www.iana.org/assignments/language-subtag-registry">http://www.iana.org/assignments/language-subtag-registry</a>)</div></span></div>