The GR-524 nixie tube is an extremely rare symbol tube made by Rodan-Okaya of Japan. The tube shows the days of the week in abbreviated Kanji as follows:
| Kanji | Day | Literal Translation |
| 日 | Sunday | Sun/Day |
| 月 | Monday | Moon |
| 火 | Tuesday | Fire |
| 水 | Wednesday | Water |
| 木 | Thursday | Tree |
| 金 | Friday | Gold |
| 土 | Saturday | Soil |
| Digit size | 19mm |
| Min current | 1.5mA |
| Max current | 3.5mA |
Datasheet
GR-524 datasheet