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What is the word "Yi" beside the golden word?

Tin x: and then what?

(1) chemical terms. A low melting point metallic element with blue-white luster, which is bivalent or tetravalent in compounds and cannot be oxidized by air. It mainly exists in the form of dioxide (cassiterite) and various sulfides (such as cassiterite)-element symbol Sn.

Jin Xilian in Historical Records and Biography of Huo Zhi

(2) Another example: Xiguzi (drum tin can with lid)

(3) Send a message "ho ho". Fine linen [fine linen]; Linen]