Plus
A. The sign + for addition, is called plus.
Example:
two plus three is equal to five
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B. The sign + (plus), is also the symbol for positive numbers.
Erasmus+ project Dictionary of Mathematics 
Project webpage:
https://do-math.weebly.com/About us:
Estonia - Surju School
Greece - 3rd Primary School of Chalastra
Spain - CEIP Profesor Carlos Socas Muñoz