He was known publicly as "Y" (Hebrew: "י")
https://en.wikipedia.org/wiki/Yossi_Cohen
https://www.timesofisrael.com/netanyahu-said-set-to-tap-yossi-cohen-as-next-mossad-chief/
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(Yonatan Sindel/Flash90)
Benjamin Netanyahu is set to name his national security adviser Yossi Cohen as his pick to lead the Mossad, senior officials in the Prime Minister’s Office reportedly said Monday. The new appointee will replace Tamir Pardo, who steps down in January.
Netanyahu will deliver a previously unscheduled statement at 8.15 p.m, during Israel’s prime-time evening news programs. The announcement sparked broad speculation he is to name the new head of the Mossad spy agency.
Unlike most security appointments, this decision is that of Netanyahu alone, as the Mossad operates under the direct authority of the Prime Minister’s Office.