Proper noun
SSPX
Initialism of Society of St. Pius X, a group of traditionalist Roman Catholics.
Kink mode stabilization by a resistive wall has been demonstrated in RFPs and tokamaks, and will be investigated in other configurations including STs (NSTX) and spheromaks (SSPX). Source: Internet
The two most prominent instances were the expansion of the use of the Tridentine Mass and the lifting of the excommunication on four bishops from the Society of St. Pius X (SSPX). Source: Internet