The shield is patterned after a logo designed for the city by Robert Miller in 1969. The green field represents Delta's rich farmlands. In the centre, the silver disc represents the sun, enclosed by the silver triangle, referring to the Greek letter. The crest is composed of the red and white mural coronet, symbolizing a Canadian district municipality and the upper half of a silver ship's wheel, for water-based commerce.

The two silver horses represent Delta's foundation industry, agriculture, and its ongoing importance to the community as well as the corporation's strength. Each horse is distinguished by collars and medallions referring to two industries, grain growing and fishing.

The compartment symbolizes the municipality; green fields bordered by the sea and the river and includes symbols for the Fraser and Boundary Bay. The motto (Yours To Preserve By Hand and Heart) is reminiscient of the 4-H club, which teaches agricultural life to children.

Data abridged from here, which was from
The Greater Vancouver Book