正号 +

Plus Sign + depicts the operation of addition. It looks like a small cross vertically standing in the middle of the line. Similar Unicode characters are ± , ∓ , , ⩲ .

「Plus」 is translated to Latin as 「more.」 The first use of this symbol was noticed in 1489. It was Johann Widman who mentioned the plus sign for the first time in his commercial treatise to illustrate some kind of increase.

You can find this symbol in Unicode here 基本拉丁字母  0000–007F . Other mathematical operators are located in the following blocks: 数学运算符  2200–22FF and 追加数学运算符  2A00–2AFF .

符号 「正号」 包含在 「基本拉丁字母」 块的 「ASCII数学运算符」 子块中，并在1993年作为Unicode版本1.1的一部分获得批准。