QSA
QSA commonly refers to a Qualified Security Assessor who audits PCI‑DSS compliance, and it is also used informally in web development to denote query‑string appending techniques.
Miscellaneous
Quark Squark Alignment
Query String Append
Qualified Security Assessor
Quaker Social Action
Quality System Assessment
Qualified Security Assessors
Quiet Sound Amplifier
Quantification Settlement Agreement
Query String Appended
Query String Appending