First, (Cantonese spelling) sin 1 and sin3 are pronounced "Xian" and "Xian" respectively.
Interpretation: 1, (used as an adverb) in, only. For example, drop out of school ~ do it; Eat soup ~ rice.
2. (verb) When you weigh something, the scale tilts upward (indicating a little more weight). For example, scale ~ Jue.
3. Short name of Mr. (noun) (not used before liberation). Like feng shui.
Well, the landlord may want to write the word "mm"