Answer: plus

AnswerCrossword Clue
PLUSValuable quality
PLUSGrade elevator
PLUSSign that can mean "better than"
PLUS+
PLUS"But wait, there's more!"
PLUSGrade qualifier
PLUSBonus
PLUSFavorable factor
PLUSPositive sign
PLUSCross with addition problems
PLUSCalculator symbol
PLUSFurthermore
PLUSGood thing
PLUSIn addition to
PLUSMath sign
PLUSIt makes a B better
PLUSFavorable thing
PLUSPositive factor
PLUS"Not only that ..."
PLUSCalculator key
plusincreased by
PLUSSign in a sum
PLUSAnd in addition
PLUSAsset
PLUSHigh 80s mark
PLUSUseful feature
PLUSIn addition
PLUSPositive
PLUSAdvantage
PLUSGrade booster
PLUS"That's not all"
PLUSMore than
PLUSBenefit
PLUSGood point
PLUSGrade enhancer
PLUSGrade modifier
PLUSSign in math class
PLUSAddition word
PLUSSign between numbers, maybe
PLUSAnd