Keyword Analysis & Research: what does initial mean in signature

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what does initial mean in signature	1.05	0.9	6742	86	35
what	0.16	0.5	412	21	4
does	0.99	0.4	1505	71	4
initial	0.63	0.7	9248	41	7
mean	0.15	0.5	3601	54	4
in	0.69	0.9	3748	18	2
signature	0.83	0.6	7524	39	9

Keyword	CPC	PCC	Volume	Score
what does initial mean in signature	1.16	0.5	3148	86