What does STIF stand for?

Scientific and Technical Information Facility - NASA

Search Track Intermediate Frequency - Military

Short-Term Investment Fund (SAUS)

Short-Term Irradiation Facility - Nuclear energy (NRCH)

Short-Term Issuance Facility - Finance

Soft Tissue Interstitial Fluid (SAUS)

Spectral Transmission Interference Filter

Stiffener - Civil engineering