Robert Recorde, The designer ofwel 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://sparktv.net/post/277805_https-foliemolie-nl-https-foliemolie-nl-een-ieder-mag-zelf-bestaan-keuken-wrappe.html