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What are gl, el, gle, ele, elc? For buildings in a small area, gl is used as a way to mark the elevation on the drawing to calculate the height difference from the road. gl (ground level) is relative elevation, commonly used in centimeters. For example, specify a path. How to make a downward triangle? This is found in the symbol, please copy and use it! How to type a downward solid triangle. This can be obtained by piecing together multiple black rectangles. Thank you ~ How to type a downward triangle on a computer? In the QQ input method, press the letter i key to select the symbol.