| Subject | English | Japanese |
| hist.fig. | Cao Cao 155-220, famous statesman and general at the end of Han, noted poet and calligrapher, later warlord, founder and first king of Cao Wei, father of Emperor Cao Pi | 曹操 |
| radiol. | four-pi 4 π counter | 4パイ4p計数器 |
| phys. | four pi counter | 4π計数管 (よんぱい・けいすうかん) |
| hist.fig. | Haruno Pi-chiku | 晴乃ピーチク (1925.9.28-) |
| tech. | PI proportional integral action | PI 動作 (ビー•アイどうさ) |
| given. | Pi-chiku | ピーチク |
| gen. | n pi conjugation | パイ共役 |
| gen. | PI control | PI制御 |
| gen. | n pi electron | π電子 |
| auto.ctrl. | PI element | 比例積分要素 |
| given. | Pi-ko | ピーコ |
| gen. | n pi meson | π中間子 (π-chūkanshi) |
| geogr. | Pi'ndhos Oros Mountains | ピンドス山脈 |
| given. | Pi-to | ピート |
| gen. | PI-type joint | PI形継手 |
| geogr. | Piest'any | ピエシチャニ |