Keyword Analysis & Research: what does plus or minus mean

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what does plus or minus mean	0.77	0.8	9994	8	28
what	0.87	1	3781	22	4
does	1.4	1	7894	91	4
plus	0.39	0.7	4364	49	4
or	0.1	0.6	2550	59	2
minus	0.34	0.1	3962	1	5
mean	0.2	0.9	1057	39	4

Keyword	CPC	PCC	Volume	Score
what does plus or minus mean	0.15	0.3	3273	18