Online, the symbol is meant to represent a person saluting, with the o being a person's head and the 7.. People often abbreviate years using the two last numbers in the sequence, so if it appears that someone might be referring to a time, 07 probably refers to 2007.
The year 2007, or any year ending with 07 the month of july 7 (number) fifa 7 madden nfl 07 cricket 07 the number of the french department ardèche the musical duo zero 7.. O7, sometimes incorrectly formatted as 07, is an emoticon that later became a twitch emote.