Initialism of heat shock protein. / Initialism of Henoch-Schönlein purpura. / Initialism of halal snack pack. / (psychology) Initialism of highly sensitive person.

plural of HSP

(communication, mobile) Initialism of High Speed Packet Access (amalgamation of two mobile telephony protocols that extends and improves the performance of existing 3G networks by using the WCDMA protocols.)