I'm not 100% certain I understand what you are asking, but each number in an equation is most generically called a "term," while the actual "+" or "-" symbol is called the "operator".
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Yes.
no dumby it is just term
Terms of an Expression
5-k
To write "5 subtracted from a quarter of s" as an expression, you can first express a quarter of s as s/4, and then subtract 5 from it. The expression would be s/4 - 5.