Keyword Analysis & Research: what does arrow mean in er diagram

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what does arrow mean in er diagram	0.26	0.8	1066	47	34
what	1.2	1	8982	97	4
does	1.56	0.7	2327	29	4
arrow	1.28	0.6	9808	20	5
mean	0.16	0.9	437	47	4
in	1.33	0.2	4774	81	2
er	0.32	0.9	8728	86	2
diagram	1.96	1	1350	84	7

Keyword	CPC	PCC	Volume	Score
what does arrow mean in er diagram	1.69	0.5	3291	42