E.161

<h2 id="notes">Notes</h2>

<h2 id="external-links">External links</h2>
<ul><li><a href="http://www.itu.int/rec/T-REC-E.161/en">"E.161 Arrangement of digits, letters and symbols on telephones and other devices"</a>. <a href="/facts/International_Telecommunication_Union/Yn8UKKkw">International Telecommunication Union</a> (ITU). Feb 2, 2001 [1988]. E.161.</li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>"E.161 : Arrangement of digits, letters and symbols on telephones and other devices that can be used for gaining access to a telephone network". www.itu.int. Archived from the original on 2019-11-14. Retrieved 2019-11-14. <a href="https://www.itu.int/rec/T-REC-E.161" target="_blank">https://www.itu.int/rec/T-REC-E.161</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>ISO 9564-1:2011 Financial services — Personal Identification Number (PIN) management and security — Part 1: Basic principles and requirements for PINs in card-based systems, Annex B.4 Alpha-to-numeric mapping <a href="http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=54083" target="_blank">http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=54083</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>Known in many countries as the 'hash' key. <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
<li id="fn:4"><p>Böcker, Martin; Larsson, Karl Ivar; von Niman, Bruno, Standardization Supporting Cultural Diversity: Character Repertoires, Ordering and Assignment to the 12-key Telephone Keypad for European Languages and Languages Used in Europe (PDF), archived from the original (PDF) on 2011-07-26, retrieved 2010-12-31 <a href="https://web.archive.org/web/20110726145931/http://www.hft.org/HFT06/paper06/16_Boecker.pdf" target="_blank">https://web.archive.org/web/20110726145931/http://www.hft.org/HFT06/paper06/16_Boecker.pdf</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li>
</ol>

E.161 open-in-new

E.161