Shen Collection, Upper Volume Radical: Grass (cǎo) Tan Kangxi stroke count: 21 Page 1066, Entry 08 Pronounced tan. Erya (Erya): Explaining Plants. Tan is stone moss. Note: It is water moss. Also in the Jade Chapters (Yupian): It is seaweed. Also known as sea Luo, it grows in seawater like tangled hair. Also in the Supplement to the Dictionary (Zihui bu): Pronounced yin (rising tone). Tanyin, describing the appearance of water moving and swaying.