Answer: vincula

AnswerCrossword Clue
VINCULAAnatomical bands.
vinculahorizontal stroke or bar drawn over a quantity consisting of several members or terms in order to show that they are to be considered together
vinculabond signifying union or unity; tie
vinculaa unifying bond link tie
vinculastraight horizontal mark placed over two or more members of a compound mathematical expression and equivalent to parentheses or brackets about them (as in a-b-c=a-)