How to remember
The kanji 双 looks like two identical, mirrored objects or people standing side by side, emphasizing the idea of a 'pair'. 'Sou' — It's SO easy to see these are a PAIR of things. 'Futa' — 'FUTA' is like 'futatsu' (two), reminding you of two items in a PAIR. Vocabulary
双葉ふたば
two leaves, sprout, seedling