| 2025-05-11 | Unit of magnetic flux density |
| 2024-09-26 | Kind of radiation |
| 2023-07-21 | Like electromagnetic radiation with the shortest wavelength |
| 2023-03-16 | Kind of ray |
| 2022-12-02 | Delta follows it |
| 2021-06-05 | Third-tier caste member in "Brave New World" |
| 2020-05-24 | Delta preceder |
| 2014-11-08 | Like emissions from some 40-Down |
| 2013-12-12 | Kind of ray |
| 2010-08-16 | Letter after beta |
| 2009-10-14 | Gallows-shaped letter |
| 2009-05-11 | Letter after beta |
| 2008-03-30 | ___ radiation |
| 2007-02-26 | Letter after beta |
| 2006-07-26 | Beta follower |
| 2005-11-20 | Kind of ray |
| 2005-10-17 | Alpha, beta, ___ … |
| 2003-05-05 | Letter before delta |
| 2002-04-22 | Beta's follower |
| 1999-06-28 | Beta's follower |
| 1998-11-30 | Beta's follower |
| 1997-01-10 | Kind of radiation |
| 1996-10-24 | Symbol of magnetic field strength |
| 1995-07-03 | Delta preceder |
| 1994-11-14 | Kind of ray |