What exactly is '義訓' used for?

[Kraits]

Here are some examples that @Belthazar wrote about in another thread. I think as you read more you’ll just get to see more examples of how it’s used in text.

Odd furigana

Aye, the Aria manga has a lot of them. For example, it’s set on Mars, but a Mars that has been terraformed to the extent that it’s now covered in water, so it’s been renamed Aqua. When’s used in dialogue, though, it’s usually written as 火星アクア - it’s telling the reader that what they’re saying is “Aqua”, but what they mean is Mars. Similarly, when they refer to the Earth, it’s written as 地球マンホーム - what they’re saying is “Manhome”, but what they mean is “Earth”. But yeah, sometimes you can use o…