雷 RAI, kaminari - thunder
二 NI, futa(tsu), futa - two
三 SAN, mi(tsu), mi(ttsu), mi - three
士 SHI - samurai, man, scholar
一 ICHI, ITSU, hito(tsu) - one
The ink would dribble down, making them look like different characters!
電 DEN - electricity
元 GEN, GAN, moto - origin, foundation
王 OU - king
市 SHI, ichi - city, market
丁 CHOU, TEI - counter, block