Keyword Analysis & Research: what does the f in f stop mean

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what does the f in f stop mean	0.45	0.8	292	61	30
what	0.74	0.7	4057	97	4
does	0.82	0.7	2822	41	4
the	0.93	1	3062	19	3
f	0.69	0.8	6910	84	1
in	1.28	0.2	4972	96	2
f	1.14	0.5	6776	84	1
stop	0.18	0.6	3322	82	4
mean	0.59	0.4	9881	18	4

Keyword	CPC	PCC	Volume	Score
what does the f in f stop mean	0.94	0.4	9999	12
what the f stop	1.38	0.5	9127	47
the larger the f stop means what	0.66	0.4	8243	98
what does f stop determine	1.29	0.4	7940	40
what is the f stop number	0.23	0.2	7229	26
f stop explained in simple terms	1.28	0.7	9285	36
why is it called f stop	0.03	0.8	3851	91
what's an f stop	0.9	0.1	1309	94
how does f stop work	1.3	0.6	5352	38
f stop explained simply	0.27	0.7	9284	33
f stop numbers explained	1.57	0.3	8149	16
what does f-stop stand for	0.03	0.5	6977	82
f-stop explained	1.12	1	4658	83