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<p>[QUOTE=&quot;Numbers, post: 1182896, member: 11668&quot;]It&#039;s just there to hold down the end of the serial number, in the absence of a letter.</p><p>&nbsp;</p><p>The serial numbering system evolved over time on the large-size notes, and the Black Eagle series is a particularly good demonstration.&nbsp; Over the course of this series, four different serial numbering formats were used, and they give the distinct impression that the BEP just kept on making up new rules every time they ran out of numbers:</p><p>&nbsp;</p><ul> <li>The first 100,000,000 notes used plain numbers, with no letters at all.&nbsp; These serials had that funny-looking symbol on *both* ends.</li> <li>Then there were fourteen blocks with a letter prefix and a symbol suffix, like the one you&#039;re asking about.&nbsp; The block alphabet was A, B, D, E, H, K, M, N, R, T, V, X, Y, Z.</li> <li>The next fifteen blocks had matching prefix and suffix letters, beginning at A..A and running through to Z..Z.&nbsp; There were fifteen instead of fourteen because the letter U was included this time (the block alphabet was always a bit variable on the large-size notes).</li> <li>Finally, the last eleven blocks of the series had a constant suffix letter A, while only the prefix letter changed.&nbsp; These began at B..A and went through to X..A (with no U this time).</li> </ul><p>That fourth format begins to resemble the one that was later adopted for the small-size notes, where the suffix letter remains at A until the prefix letter has completed a full alphabet, and only then does the suffix get incremented.</p><p>&nbsp;</p><p>As for the odd symbols, they&#039;re usually just ignored when transcribing serial numbers, since their only meaning is essentially &quot;look, there&#039;s no letter here!&quot;.&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie6" alt=":cool:" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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