GET resolves cleanly here, but Asian labels often share letters with American or European ones — IST is shared between India and Israel, for instance. Pinning Asia/Tbilisi avoids that whole class of confusion.
Asia/Tbilisi does not show an offset change in the next year, which makes GET predictable for short-term scheduling. Predictable is not the same as permanent — civil-time rules still get changed by governments on relatively short notice.
For precise work, the safest equivalent of GET is the exact IANA zone used by your city or system. Asia/Tbilisi sits at +04:00, ahead of UTC, which means daily logs in this zone reach a new calendar date before UTC does — a small detail that breaks date-based reporting if missed.
Within this single zone (Asia/Tbilisi, +04:00), GET is unambiguous, so the abbreviation and the IANA zone effectively interchange.