Katakana: ニ
Romaji: ni
With this, you have your first Kanji character. Also, “ni” means “two”, so, two lines.  One suggested memory aide is to think of “two needles”.Â
 Example words:
ニコãƒãƒ³ã€€ã€€nikochin    nicotine
ニッケル  nikkeru     nickel