XPDR
Transponder. XPDR is the standard shorthand for transponder.
Expanded explanation
XPDR is the clearest alias-routing proof in the seed set
XPDR is useful for the demo because many users will search the plain-language term “transponder,” not the abbreviation. A strong glossary system should still route them to the canonical abbreviation page without creating duplicate URLs or confusion about which page should rank later.
Why it matters
XPDR is the clearest seed example of plain-language query to abbreviation-page behavior. That is exactly the kind of search-to-page routing the rebuild needs to prove.