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<p>[QUOTE=&quot;Numbers, post: 3311714, member: 11668&quot;]This is true for all the terms you list, *except* bookend.</p><p><br /></p><p>Bookend serials (where the first few digits match the last few digits, like 28700287 or 74000074) were actually of significant interest back in the heyday of currency collecting in the 1960s.&nbsp; They&#039;ve since fallen *very* far out of fashion, and these days they&#039;re probably on the same level as recently-made-up categories like trinaries, but the term itself does go back more than half a century.</p><p><br /></p><p>But NPCoin is right: &quot;bookend&quot; also refers to the notes with serial numbers adjacent to a note of special interest, usually an error note or a changeover pair.&nbsp; And it&#039;s worse than that; a serial number is sometimes described as &quot;bookended&quot; when its block letters match, like A..A or U..U or whatever.&nbsp; The poor word &quot;bookend&quot; is well and truly overworked in the currency hobby.[/QUOTE]</p><p><br /></p>

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