011525, 020101, 020131, 020137, 130113, 160104, 160107, 260508, 260512, 260515, 260521, 260921, 2613 - Other natural phenomena and observable events. Heads, portraits, busts of men not in profile. Stylized men, including men depicted in caricature form. Heads, portraits or busts of men in profile. Electric lightbulbs, flashbulbs, fluorescent tubes. Record players; tape players (video and audio); answering machines; stereo components, including sound amplifiers and speakers. Microphones, headphones. Letters, numerals or punctuation forming the perimeter of a triangle, bordering the perimeter of a triangle or forming a triangle. Triangles with bars, bands and lines. Four or more triangles. Triangles that are completely or partially shaded. Squares that are completely or partially shaded. Two quadrilaterals. Quadrilaterals that are completely or partially shaded. Geometric figures forming letters or numerals, including punctuation. Representations of objects forming letters or numerals, including punctuation.