Keyword Analysis & Research: what does the plus sign mean

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what does the plus sign mean	1.77	0.7	260	81	28
what	0.83	0.2	9239	88	4
does	0.65	1	7524	51	4
the	0.97	0.2	7114	66	3
plus	1.83	0.8	8595	24	4
sign	1.06	0.9	3949	49	4
mean	0.39	0.6	8854	81	4

Keyword	CPC	PCC	Volume	Score
what does the plus sign mean	1.05	0.6	1645	8