『ロマンテックな関係(恋愛関係)』や『性的な関係』は、スラッシュ("/")で区切って表現
友人や家族、チームメイトなど、性的な関係ではない『プラトニックな関係』は、"&" で区切って表現しますってフツーに書かれてる
How do I tag a romantic or platonic relationship?
Romantic and/or sexual relationships are indicated by using a slash ("/") separator (for example, Mickey Mouse/Minnie Mouse). Nonsexual, non-romantic relationships—such as platonic relationships between friends, family, teammates, etc.—are indicated with an "&" separator (for example, Hinata Shouyou & Kozume Kenma).
Platonic and romantic relationship tags are separate, so searching and filtering by Aerith Gainsborough & Sephiroth won't show results tagged with Aerith Gainsborough/Sephiroth unless both tags are added to the particular work or bookmark.
https://archiveofourown.org/faq/tags?language_id=en#platonic
スラッシュ(恋愛関係のCP)が好きな人はslasher だよ リレーションシップ(関係性全体)が好きな人はshipper
英語圏におけるshipperの用法と来歴 Shipping in fandom is the act of supporting or wishing for a particular romantic relationship — that is, a het (different-sex), slash (male/male), femslash (female/female), or poly (three or more par...