A couple of table top game designers came together to build an open-source colour identification system that is colorblind friendly. It uses symbols and color theory. For example: the symbol for green is a mix of the one for yellow and blue.
I could totally see those engraved on little wooden tokens for board games for example.
You can also read the full explanation of the design decisions behind it: https://boardgamewire.com/index.php/2026/07/06/designer-pair-launch-colorsym-giving-publishers-a-free-tool-for-colourblind-friendly-board-game-creation/
And if you are curious, another system exists as well: ColorADD: https://www.coloradd.net/en/