Translation guide
In Japanese, expressing 'set of three' depends on what the three items are and how they are grouped. Common counters, specific words for triplets or trios, and general terms for three-piece sets are covered here.
To refer to a set or group of three items, using the generic counter for sets.
A general term for a set of three items. '三つ' means three, and '組' means set or group. Can be used for various objects.
この三つ組の皿はお気に入りです。
This set of three plates is my favorite.
Literally 'three-item set'. Often used in commercial contexts for products sold as a set of three.
この三点セットはお買い得です。
This set of three is a bargain.
To refer to a group of three people or things that form a unit, like a trio or triplet.
A group of three people, a trio. Commonly used for a band, team, or any group of three individuals.
彼らは三人組のバンドです。
They are a trio band.
Triplets (three children born at the same time). Specifically for siblings.
Loanword from English 'trio'. Often used for musical groups or a set of three people.
To describe a set of three items that are identical or part of a collection, like a three-piece set.
Used for sets of three items like cups, bowls, or dishes. '客' is a counter for tableware.
この茶碗の三客セットをください。
Please give me this set of three teacups.
For sets of three items with legs, like chairs or tables. '脚' is a counter for furniture with legs.
三脚セットの椅子を買いました。
I bought a set of three chairs.
To refer to a set of three items that are worn or used together, like a three-piece suit or tool set.
A matching set of three items, often used for clothing like a three-piece suit (jacket, pants, vest).
彼は三つ揃いのスーツを着ている。
He is wearing a three-piece suit.
Also used for tool sets or accessory sets of three items.
この三点セットの工具は便利です。
This three-piece tool set is handy.
To express a set of three things that are part of a series, like a trilogy or three-volume set.
A trilogy, a set of three works (books, films, etc.).
この三部作はとても面白い。
This trilogy is very interesting.
A complete set of three volumes (books, manga, etc.).
このシリーズは全三巻です。
This series is a set of three volumes.
Japanese uses specific counters for different types of objects. For a set of three, you can often use the number + counter + セット (setto) or 組 (gumi). The counter depends on the item: 個 (ko) for small objects, 枚 (mai) for flat objects, 本 (hon) for long objects, etc. For example, 'a set of three plates' can be 三枚セット (sanmai setto).
Directly translating 'set of three' as 三つのセット (mittsu no setto) is understandable but not natural. Use the appropriate counter or specific term instead.
She is a mother of triplets.
I listened to a jazz trio performance.