Keyword Analysis & Research: what does pa mean after md

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what does pa mean after md	0.8	0.2	9602	82	26
what	0.27	0.4	2277	48	4
does	0.67	0.1	6391	31	4
pa	1.92	0.4	5889	83	2
mean	0.3	1	319	22	4
after	0.25	1	2379	68	5
md	1.34	0.5	300	58	2

Keyword	CPC	PCC	Volume	Score
what does pa mean after md	1.83	0.6	4892	4