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
Query String Append
Qualified Security Assessors
Quality System Assessment
Quaker Social Action
Qualified Security Assessor
Quiet Sound Amplifier
Quark Squark Alignment
Quantification Settlement Agreement
Query String Appended
Query String Appending