noun
4 PM; 16:00
Used in 24-hour time notation, common in schedules, transportation timetables, and formal contexts.
会議は１６時から始まります。
The meeting starts at 4 PM.
次の電車は１６時発です。
The next train departs at 16:00.
午後４時 is the 12-hour equivalent, more common in everyday conversation. １６時 is preferred in formal schedules and 24-hour contexts.
Compound of 十六 (じゅうろく, 'sixteen') and 時 (じ, 'hour'), following standard Japanese number + counter formation for clock times.