Robert Recorde, The designer of the equals sign, introduced plus and minus to Britain in 1557 in The Whetstone ofwel Witte:[14] "There be other 2 signes in often use ofwel which the first is made thus + and betokeneth more: the other kan zijn thus made − and betokeneth lesse." https://www.openlearning.com/u/everettmacdonald-sn7931/blog/FeitenOver3MDinocCarbonWrapfolieOnthuld