Which of the following symbols indicates a horizontal sliding window?

• A. A double rectangle
• B. A dashed line
• C. A solid line with lines through it
• D. A solid rectangle with a line

Answer: (C)

The symbol that indicates a horizontal sliding window is represented by a solid line with additional lines through it. This design effectively conveys the function and operation of the window: the solid lines typically outline the window frame, while the lines through it suggest the sliding motion that is characteristic of this type of window. This visual representation is widely recognized in architectural drawings, where clarity and functionality are essential for conveying design intent.

The other options do not accurately represent a horizontal sliding window. A double rectangle might suggest a different type of window or door that doesn’t specifically indicate the sliding functionality. A dashed line could refer to elements that are not visible or are intended to be seen in a particular context, like hidden elements, but it does not denote a window type. Similarly, a solid rectangle with a line could mislead as it does not distinctly show the sliding aspect of the window, lacking the clarity needed to indicate movement. Thus, the correct choice effectively illustrates the purpose and operation of a horizontal sliding window.