中国核潜艇出现在美国:What does TOP mean in the international etiquette?

What does TOP mean in the international etiquette? What does ABC mean? what does abcdefghijkmnopqrstuvwxyz mean What does ABS mean ? what does preppy mean? What does this mean? What does JIST mean? what does hmph mean? what does ghg mean? what does novel mean?