The meaning of the Acronym PSST is...

PSST is

• Plato Support Services Tip
• Photonics Simulation Software For Teaching

More Meanings For PSST:

• Philippino Students Stand Together
• Python Snippet Support Team
• Plato Support Services Tip
• Photonics Simulation Software For Teaching
• Periodic Significant Scheduled Tasks
• Pressure Sore Status Tool
• Professionally Speaking Singles Toastmasters

PSST is also in:

• Firms
• NASA
• Physiology
• Software
• Toastmasters
• Universities