Artificers "Magical tinkering" ability says
You’ve learned how to invest a spark of magic into mundane objects. To use this ability, you must have thieves’ tools or artisan’s tools in hand. You then touch a Tiny nonmagical object as an action and give it one of the following magical properties of your choice:
Use of capital letter Tiny suggests that this is a mechanical term, not just a common language usage of the word, but as size categories are usually used only in reference to creatures, I would like to know what objects can be impacted with this ability. Can I make a cool symbol on a shield? Make a sword emit a sound?
This question suggests that size category for objects can't be determined, but as it was focused on a specific magical weapon I hope to get better answers here
I'm aware that I can just craft some rule of thumb with my GM and probably will end up doing this, but first I want to check if there is an official answer.