Partial thromboplastin time 
Postal Telephone and Telegraph 
Push to Talk 
PLATFORM TRANSMITTER TERMINAL 
Post Telephone and Telegraph 
Postal Telegraph and Telephone 
Part Task Trainer 
platform transmitter terminals 
Post Telegraph and Telephone 
Postal Telephone & Telegraph 
Postal Telephone Telegraph 
Postal, Telephone and Telegraph 
Posts, Telegraphs and Telephones 
Press To Talk 
Professional Technical Trainer 
prothrombin time 
Public Telephone and Telegraph 
IATA code for Pratt Industrial Airport… 
pain tolerance threshold 
parenchymal transit time 
Parital thromboplastin time 
part thromboplastin time 
Partial 
partial thromboplastin 
partial thromboplastin times 
Part-Time Temporary 
Part-Time Temporary Teacher 
PEAK TRENDS TRUST 
peak twitch tension 
Per Thread Time