The Three Sacred Treasures of Japan (mirror, sword, and jewel), symbolic emblems of imperial authority and important in historical and ritual contexts.
三種の神器は日本の皇室の重要な象徴だ。
The Three Sacred Treasures are important symbols of the Japanese imperial family.
博物館では三種の神器に関する展示が行われている（実物ではない場合が多い）。
The museum has an exhibition about the Three Sacred Treasures (often not the actual objects).
歴史書には三種の神器の伝承が詳しく記されている。
Historical texts give detailed accounts of the traditions surrounding the Three Sacred Treasures.
Figuratively, an idiomatic expression meaning a set of three items considered essential status symbols or necessities for a certain position or lifestyle.
彼にとっての三種の神器は、高級車・一戸建て・海外旅行だ。
For him, the Three Sacred Treasures are a luxury car, a detached house, and foreign travel.
新社会人の三種の神器としてスマホ・スーツ・名刺入れが挙げられることがある。
Sometimes the 'three must-haves' for new employees are cited as a smartphone, a suit, and a business card holder.
流行に合わせて、若者の三種の神器は変わってきた。
As trends change, the three 'must-have' items for young people have shifted.