| Clue | Source | Date |
|---|---|---|
| Unchanging variables | Family Time | 17 Oct 2022 |
| They don't vary | Family Time | 08 Nov 2021 |
| Mathematical parameters that don't not change their value | Irish Times Simplex | 27 Jan 2018 |
| Study street workers in unchanging situations | ||
| Uniform factors | Newsday | 27 Aug 2016 |
| They're not variable | ||
| Pi and others | ||
| Pi and others | ||
| Unchanging entities | ||
| Pi and others | ||
| Things that don't change | ||
| Fixed values | ||
| Unchanging things. |