So I need to understand the pricing lingo when it comes to buying a mailing list,

please help, here is an example,

67,598 TOTAL UNIVERSE / BASE RATE $75.00 /M
67,598 TOTAL PODIATRISTS $75.00 /M

What does " $75.00 /M" mean?

And what of these terms,

KEY CODING $3.00/M
CARTRIDGE (FLAT FEE) $25.00/F
DISKETTE (FLAT FEE) $25.00/F
EMAIL DELIVERY (FLAT FEE) $50.00/F
KEYING $3.00/M
NCOA $3.00/M
NCOA (MINIMUM) $250.00/F
P/S LABELS $10.00/M


Things like "$25/F", what does F stand for?

THANKS