V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PTI
       Payload Type Identifier (ATM, PT)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PTI
       Polskie Towarzystwo Informatyczne (org., Poland)


The Free On-line Dictionary of Computing (30 December 2018):

Portable Tool Interface
PTI

    (PTI) A standard such as PCTE,
   allowing interworking between different software tools via
   defined interfaces to the user and to the repository or
   object management system.

   (2000-09-25)