My instinct is often that there should be some technical word for the common class of equations and inequalities. That is: statements that connect two numerical expressions, with a relational operator in the middle. Granted that "relation" collects the operators of equality, lesser-than, etc., it seems like there should likewise be a common word for the class of statements using those symbols.
One halfway common name I see is mathematical sentence. I'm not sure how widespread this really is; and it seems to lack the feeling of a technical mathematical term. In fact, today on social media I saw a number of parents of school children react vehemently to the phrase, saying that it had to be obviously nonsense. (Here's a more technical definition that I doubt they'd be any happier about.)
So: Is there any more widely-used convention in mathematical circles for a name of the common class of equations and inequalities? Or is "mathematical sentence" the best we have?