Keyword Analysis & Research: what does the less than sign underlined mean

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what does the less than sign underlined mean	0.31	1	6924	61	44
what	1.58	0.9	7024	82	4
does	0.71	0.6	3476	57	4
the	0.6	0.5	9891	3	3
less	1.12	0.7	2401	20	4
than	1.66	0.6	150	3	4
sign	1.72	0.1	3564	98	4
underlined	0.23	0.7	4608	81	10
mean	0.63	0.8	7710	92	4

Keyword	CPC	PCC	Volume	Score
what does the less than sign underlined mean	0.19	0.7	3789	96