| GASES | Kr and Xe on the periodic table, e.g. |
| INERT | Like the elements He, Ne and Xe |
| FACT | "J and Q don't appear on the periodic table," e.g. |
| WELHAM | Kris ?, Salford Red Devils and former Hull KR and Bradford Bulls centre |
| SHAUNLUNT | Hull KR and former Castleford Tigers, Workington Town and Huddersfield Giants hooker |
| PETAHIKU | New Zealand, Hull KR and former Warrington Wolves, New Zealand Warriors and North Queensland Cowboys centre (4,4) |
| PETERU | Nathaniel ...... , former Leigh Centurions, Hull KR and Leeds Rhinos prop (6) |
| LITTEN | Hull KR and 2017-19 Hull FC hooker (6) |
| JEZ | Hull KR and 2017-19 Hull FC hooker (3) |
| OPACIC | Tom ...... , Hull KR and 2021 -22 Parramatta Eels centre (6) |
| MINCHELLA | Hull KR and 2018-19 Bradford Bulls back-rower (9) |
| ELLIOT | Hull KR and 2018-19 Bradford Bulls back- rower (6) |
| EDEN | Greg .... , former Castleford, Huddersfield, Hull KR and Featherstone wing/full-back (4) |
| TANGINOA | Hull KR and 2019-23 Wakefield Trinity prop (8) |
| KELEPI | Hull KR and 2019-23 Wakefield Trinity prop (6) |
| NOBLEGASES | He, Ne, Ar, Kr, Xe, Rn and Og? |
| JOE | Toulouse, 2016-18 Hull KR and 2020-24 Hull FC loose forward (3,5) |
| CATER | Toulouse, 2016-18 Hull KR and 2020-24 Hull FC loose forward (3,5) |
| NONO | Elbows on the table, e.g. |
| FIDGET | Drum your fingers on the table e.g. |
