The relations between rough sets and algebraic systems have been already considered by many mathematicians, and rough sets\r\nhave been studied in various kinds of algebraic systems. This paper concerns a relationship between rough sets and ternary\r\nsemihypergroups. We introduce the notion of rough hyperideals and rough bi-hyperideals in ternary semihypergroups. We\r\nalso study fuzzy, rough, and rough fuzzy ternary subsemihypergroups (left hyperideals, right hyperideals, lateral hyperideals,\r\nhyperideals, and bi-hyperideals) of ternary semihypergroups
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