ATB

(In SMS-language:) all the best
Found on https://www.encyclo.co.uk/local/20494

ATB

(initial) Alloyed Tritanium Bar.
Found on http://wiki.eveonline.com/en/wiki/Glossary

ATB

(Say: A - T - B) - For All Terrain Bike (another term for a mountain bike).
Found on https://www.encyclo.co.uk/local/22515

ATB

Advanced Technology Bomber. Development program for the Northrop B-2 [US]
Found on http://www.jedsite.info/index.html

ATB

Air Transport Association of America
Found on http://www.aea.be/glossary/

atb

all the best
Found on http://www.noslang.com/dictionary/a/

ATB

All-terrain bicycle. A mountain bike.
Found on http://www.dailypeloton.com/cyclegloss.asp

ATB

Amazon Tree Boa
Found on http://www.kingsnake.com/articles/Glossary.html

ATB

an all-terrain bicycle.
Found on http://bikecult.com/bikecultbook/glossary_english.html

ATB

Antibiotic
Found on http://www.translationdirectory.com/glossaries/glossary124.htm

ATB

Ash treatment basin
Found on http://www.encyclo.co.uk/local/20824

ATB

Attitudes, Thinking & Behaviour
Found on http://www.cjp.org.uk/glossary/
No exact match found