慎入

慎入	shèn rù	keep away! / proceed with caution!
慎	shèn	careful / cautious
慎	shèn	old variant of 慎
入	rù	to enter; to go into / to join; to become a member of / (bound form) to conform to (as in 入时) / abbr. for 入声 / (on product packaging, after {number n} + {classifier}) containing (n pieces) (from Japanese 入 "iri")