Answer: xii

AnswerCrossword Clue
XII

Sundial figure

XII

III x IV

XII

It may atop a clock

XII
High on Big Ben
XII
Top of the hour in Rome?
XIIMidnight in Old Rome
XIINoon for Nero
XIINoon on some clocks
XIINoon on a sundial
XIIOvid's dozen
XIICaligula's dozen
XIILivy's lunch hour?
XIIN : compass :: .. : clock
XIICaesar's dozen
XIIFirst Super Bowl played in prime time
XIISundial number
XIIIt may be to the left of an "I"
XIINoon indicator
XIIIV tripled
XIIUppermost number, sometimes
XIIIt may be seen opposite VI
XIIIt's at the top of many a round face
XIISundial numeral
XIILunchtime, on a sundial
XIIMidnight, on a grandfather clock
XIISundial topper
XIIWitching hour
XIIGrandfather clock number
XIIHour on a clock face
XIIWitching hour on a grandfather clock
XIITop of the hour?
XIITop numeral on many a grandfather clock
XIINumber at the top of a grandfather clock
XIINoon, on a sundial
XIILargest number on a sundial
XIISundial hour
XIINumber on a dial
XIITwice VI
XIIClock number
XIIMidnight indicator, maybe