TLAs
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This is a list of TLAs, Three Letter Acronyms. I will add to this when I think of a new one. The rule is it must be three letters. Comment with a new TLA is welcome, I will add it and delete the comment.

A- ALS
B-
C-
D-
E- EOD
F-
G- GED
H- HAL
I- IBM
J-
K-
L- LED LNG
M-
N-
O-
P- PGA
Q- QRM
R- RPM
S-
T- TKO TLA
U- USA
V-
W- WPA WEP
X-
Y-
Z-

There could be dozens of Greek letter fraternities and sororities here.