| 2026-03-27 | E, in a code |
| 2025-06-04 | Morse bit |
| 2024-05-26 | Morse code click |
| 2023-04-18 | Dah's counterpart, in Morse code |
| 2021-09-26 | E, in Morse code |
| 2021-02-21 | Bit of Morse code |
| 2020-11-03 | E, in Morse code |
| 2019-10-03 | Telegraph "e" |
| 2014-06-19 | Morse bit |
| 2013-12-27 | Morse bit |
| 2012-03-05 | Dah's counterpart in Morse code |
| 2011-09-22 | Dah's go-with |
| 2010-05-16 | Morse code sound |
| 2008-12-23 | Dah's counterpart |
| 2006-02-08 | Telegraphed sound |
| 2005-08-25 | Morse bit |
| 2004-12-10 | Morse code tap |
| 2003-11-13 | Morse tap |
| 2003-04-24 | Telegraphic click |
| 2001-06-09 | One-quarter of an H, in Morse code |
| 2000-11-26 | Telegraph sound |
| 2000-05-28 | Morse minimum |
| 1999-11-28 | Morse code click |
| 1999-06-17 | Morse minimum |
| 1999-05-04 | Dah's go-with |
| 1998-12-28 | Dah's partner |
| 1998-12-06 | Morse code click |
| 1998-08-12 | Dah's partner |
| 1998-05-16 | Morse tap |
| 1997-12-17 | E, in Morse |
| 1997-06-09 | Morse code click |
| 1997-02-23 | Code word |
| 1996-12-01 | Radio code sound |
| 1995-09-12 | Dah's partner |