1ABC 
/ˌeɪˌbiˈsi:/ noun
plural ABCs or ABC's /ˌeɪˌbiˈsi:/ noun 1 : the letters of the English alphabet [plural] ▪ (US) We learned our ABC's. [singular] ▪ (Brit) We learned our ABC. 2 : the most basic or important information about a subject [plural] ▪ (US) learning the ABC's of wine [singular] ▪ (Brit) learning the ABC of wine
(as) easy as ABC — see 1easy
