Keyword Analysis & Research: what does istg mean in a text

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what does istg mean in a text	0.94	0.4	9313	90	29
what	1.58	0.4	1778	67	4
does	0.27	0.1	757	72	4
istg	1.14	0.2	608	9	4
mean	1.88	0.9	8739	18	4
in	0.75	0.1	1019	15	2
a	0.46	0.3	1451	31	1
text	0.52	0.4	1878	51	4

Keyword	CPC	PCC	Volume	Score
what does istg mean in a text	0.31	1	958	8