What is the correct counter to translate 'One Piece'?


I was wondering whether the anime is actually called that way because it is
hard to convey this meaning in japanese with a single word. For those who are
not aware, One Piece is the greatest treasure in the world buried in one
place, so it is probably something huge and not having clear bounds.

>
> 富、名声、力。この世の全てを手に入れた男、海賊王、ゴールド・ロジャー。彼の死に際に話った一言は人々を海へかり立てた。「俺の財宝か？欲しけりゃくれてやる。探せ！この世の全てをそこに追いてきた。」

Can we translate 'One Piece' to japanese better than 一個?




> I am more like curious what it would be called in japanese if it wasn't
> called via an English word

Okay... ワンピース has been referred to as **ひとつなぎの大秘宝【だいひほう】** (literally
"unseparated great hidden treasure") several times, so you may think this is
the official "Japanese translation".

[![enter image description
here](https://i.stack.imgur.com/q1qL9.png)](https://i.stack.imgur.com/q1qL9.png)

一個 is just a mundane phrase used to count small objects, and it makes no sense
as the name of a treasure. Basically it's very hard to talk about the correct
counter for this "piece" since no one knows what it is like. Choosing a
counter may give the readers a big hint of what it is like. For example, if we
called it ひとかけらの秘宝 using a counter かけら ("particle", "fragment"), it would end
up assuming _One Piece_ is a tangible hard object that may break. ひとつなぎ
("unseparated", "one big") is a clever word choice that avoids this problem.




> I am more like curious what it would be called in japanese if it wasn't
> called via an English word

Okay... ワンピース has been referred to as **ひとつなぎの大秘宝【だいひほう】** (literally
"unseparated great hidden treasure") several times, so you may think this is
the official "Japanese translation".

[![enter image description
here](https://i.stack.imgur.com/q1qL9.png)](https://i.stack.imgur.com/q1qL9.png)

一個 is just a mundane phrase used to count small objects, and it makes no sense
as the name of a treasure. Basically it's very hard to talk about the correct
counter for this "piece" since no one knows what it is like. Choosing a
counter may give the readers a big hint of what it is like. For example, if we
called it ひとかけらの秘宝 using a counter かけら ("particle", "fragment"), it would end
up assuming _One Piece_ is a tangible hard object that may break. ひとつなぎ
("unseparated", "one big") is a clever word choice that avoids this problem.

