The left shape could symbolize the sun. In Christian iconography, the sun and moon are often depicted as witnesses to Christ's crucifixion. The trails might represent rays of light or movement, symbolizing divine observation or cosmic alignment.
Right shape (gray with trailing lines):
Likely represents the moon, often shown opposite the sun in these depictions. The trailing lines could be an artistic interpretation of its phases, light, or its connection to earthly and divine cycles.
The UFOs in this tapestry appear to leave less to the imagination.
Like the first artwork, the UFO here is likely representing the sun.