The coat of arms of Sveta Nedelja is a blue shield with three intertwined white rings. The rings, and the shield itself, are trimmed in black. The white rings symbolize the Holy Trinity, which is of important historical significance to the town and the Feast of the Holy Trinity Day is solemnly celebrated as the town holiday.
The flag of Sveta Nedelja is white. In the middle of the flag is the coat of arms of Sveta Nedelja trimmed black. The ratio of the width and height of the flag of the town is 2:1.
The celebration of the Town Day of Sveta Nedelja is associated with the Feast of Holy Trinity (May/June) when numerous events are held: painting exhibitions, classical music concerts, sports programs, entertainment programs with performances by cultural and artistic groups, and entertaining evening programs with concerts.
