1:72 is modeller/wargamer shorthand for the scale of the individual miniatures used on the tabletop aforementioned. It also identifies me to the community as an outlier, which is a polite way of calling someone a nutball or pariah.
You see, most of the DBA wargame community plays in 15mm scale, and 1:72 figures or minis to use the American jargon are seen mainly as toys.
A 1:72 mini is typically made in softish plastic, with realistic human dimensions. It stands about 23mm tall, though variations between 20mm and 25mm are possible.