the symbol (+) indicating summation or a positive quality.
The 13th Zodiac Sign: OphiuchusWhether or not you believe that the sun, moon, stars, and planets have any bearing on your personality, you probably know what your astrological sign is. But have you heard of Ophiuchus? Some astrologers consider it to be the 13th astrological sign.
Origin of plus sign
First recorded in 1645–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for plus sign
the symbol +, indicating addition or positive quantity
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012