image symbol set(ISS)

In System/38 graphics,a graphics symbol set in which each character is treated as a small image and is described by a rectangular array of picture elements.; IBM System/38制图系统中的一种图形符号集,其中的每一个字符都作为一个小图象来 处理,并且由图象元素的一个矩形阵列来描述。