QSO

Symbol

 * 1)  Can you communicate with ... direct or by relay?
 * 2)  I can communicate with ... direct (or by relay through ...).
 * 3)  A two-way amateur radio contact.

Noun

 * 1)  a quasar
 * 2)  A radio-quiet quasar.

Related terms

 * RQQ
 * RIQ
 * RLQ
 * YSO
 * SSO
 * PSO

Verb

 * 1)  To communicate (with) by means of amateur radio.