What are the Kanji symbols for sister-in-law?

There isn't one single Kanji symbol for "sister-in-law." The specific Kanji used depends on the relationship to the sister-in-law:

For a brother's wife:

* 義姉 (ぎし) (gishi): This is the most common term and means "elder sister-in-law"

* 義妹 (ぎまい) (gimai): This means "younger sister-in-law"

For a wife's sister:

* 義妹 (ぎまい) (gimai): This means "younger sister-in-law"

* 義姉 (ぎし) (gishi): This means "elder sister-in-law"

Important notes:

* The terms are often used based on age, not necessarily whether the sister-in-law is older or younger than the speaker.

* The term "義" (gi) indicates a relationship by marriage.

* In more casual situations, "お姉さん" (oneesan) and "妹さん" (imouto-san) are used for older and younger sisters-in-law respectively.

Therefore, the Kanji symbols for "sister-in-law" depend on the specific context.