What does the stamp ผ 30 mean on my passport after flying from Penang to Phuket?

The stamp you received (ผ 30) is an immigration stamp indicating your entry into Thailand. This stamp may represent a specific type of visa exemption or entry allowance, typically allowing you a certain number of days in the country. It is important to verify the specifics of your entry permission to understand the duration of stay and any visa requirements.