Stop may refer to:
In geometry, the octagrammic prism is one of an infinite set of nonconvex prisms formed by square sides and two regular star polygon caps, in this case two octagrams.
Stop! is a song written by Mikaela Stenström och Dimitri Stassos, and performed by Sibel Redžep at Melodifestivalen 2010. The song participated in the semifinal inside the Malmö Arena, but didn't make it further. It as also released as a single the same year. and peaked at 27th position at the Swedish singles chart.
Placid is a masculine given name, and may refer to:
Saint Placidus (also known as Saint Placid) was a disciple of Saint Benedict. He was the son of the patrician Tertullus, was brought as a child to St. Benedict at Sublaqueum (Subiaco) and dedicated to God as provided for in chapter 69 of the Rule of St. Benedict (oblate).
Here too occurred the incident related by St. Gregory the Great (Dialogues, II, vii) of his rescue from drowning when his fellow monk, Saint Maurus, at Saint Benedict's order ran across the surface of the lake below the monastery and drew Placidus safely to shore. It appears certain that he accompanied Saint Benedict when, about 529, he removed to Monte Cassino, which was said to have been made over to him by the father of Placidus.
Of his later life nothing is known, but in an ancient psalterium at Vallombrosa his name is found in the Litany of the Saints placed among the confessors immediately after those of Saint Benedict and Saint Maurus; the same occurs in Codex CLV at Subiaco, attributed to the ninth century.