Answer:
ル Katakana "Ru"
由 YUU, YU, YUI, yoshi - reason, cause
亘 KOU, SEN, wata(ru), moto(meru), nobu, touru, hisashi - span, reach
三 SAN, mi(tsu), mi(ttsu), mi - three
一+日+ハ ICHI, ITSU, hito(tsu) - one / NICHI, JITSU, hi, ka - sun, day / Katakana "Ha"
Add | , a straight line, to make them something different!
川 SEN, kawa - river
曲 KYOKU, ma(geru), ma(garu) - curve, bend
車 SHA, kuruma - wheel,vehicle
手 SHU, te - hand
東 TOU, higashi - east