numeric
thirty; 30
Standard numeral for the quantity thirty.
このクラスには三十人の学生がいます。
There are thirty students in this class.
三十ページまで読んでください。
Please read up to page thirty.
numeric
6am
Only when written ３０
Colloquial use of 30 to mean 6:00 a.m., from the 30th hour of a 24+ hour clock system sometimes used in late-night scheduling. Restricted to the Arabic numeral spelling ３０.
明日の集合は３０時だって。つまり朝の６時だよ。
They said the meeting time tomorrow is 30 o'clock. That means 6 a.m.
Archaic single-character form for thirty; not used in modern Japanese.
Common Arabic numeral spelling, especially in horizontal writing and for the colloquial time sense.
Kanji with a zero marker; sometimes seen in vertical writing or formal contexts.
Formal legal/financial kanji (daiji); rarely used in everyday writing.
Archaic variant of 卅; essentially obsolete.
Compound of 三 (san, 'three') and 十 (jū, 'ten'). The reading みそ is an older native Japanese form, now obsolete.