PTT

• Postal Telegraph and Telephone (several)
• Postal Telephone and Telegraph (several)
• Public Telegraph and Telephone (several)
• Public Telephone and Telegraph (several)

• Ministry of Post, Telegraph and Telephone (Iran)
• Part task trainer (military)
• Partial Thromboplastin Time
• Partido Trabalhista Timorense
• Poste, Téléphone et Télécommunications (France)
• Protein Truncation Test
• Push to talk